| EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended | 
|---|---|
| Dec. 31, 2023 | |
| Employee benefits plans [Abstract] | |
| Schedule of Components of Pension Expense, the Funded Status of the Plan, Amounts Recognized in the Consolidated Statements of Financial Condition, and Major Assumptions | (Dollars in Thousands)  2023  2022  2021  Change in Projected Benefit Obligation:  Benefit Obligation at Beginning of Year  $  108,151 $  172,508 $  212,566 Service Cost  3,488 6,289 6,971 Interest Cost  5,831 4,665 4,885 Actuarial Loss (Gain)  6,936 (39,962) (14,934) Benefits Paid  (3,843) (2,139) (2,087) Expenses Paid  (276) (416) (259) Settlements  - (32,794) (34,634) Projected Benefit Obligation at End of Year  $  120,287 $  108,151 $  172,508 Change in Plan Assets:  Fair Value $  104,276 $  165,274 $  171,775 Actual Return on Plan Assets  19,138 (25,649) 30,479 Employer Contributions  6,000 - - Benefits Paid  (3,843) (2,139) (2,087) Expenses Paid  (276) (416) (259) Settlements  - (32,794) (34,634) Fair Value $  125,295 $  104,276 $  165,274 Funded Status of Plan and Accrued Liability Recognized at End of Year:  Other (Assets) Liabilities  $  (5,008) $  3,875 $  7,234 Accumulated Benefit Obligation at End of Year  $  102,642 $  91,770 $  149,569 Components of Net Periodic Benefit Costs:  Service Cost  $  3,488 $  6,289 $  6,971 Interest Cost  5,831 4,665 4,885 Expected Return on Plan Assets  (6,805) (10,701) (11,147) Amortization of Prior Service Costs  5 15 15 Net Loss Amortization  934 1,713 6,764 Net Loss Settlements  - 2,321 3,072 Net Periodic Benefit Cost  $  3,453 $  4,302 $  10,560 Weighted-Average Discount Rate  5.29% 5.63% 3.11% Rate of Compensation Increase (1) 5.10% 5.10% 4.40% Measurement Date  12/31/23 12/31/22 12/31/21 Weighted-Average Discount Rate  5.63% 3.11% 2.88% Expected Return on Plan Assets  6.75% 6.75% 6.75% Rate of Compensation Increase (1) 5.10% 4.40% 4.00% Amortization Amounts from Accumulated Other Comprehensive Loss:  Net Actuarial Loss (Gain) $  (5,397) $  (3,612) $  (34,265) Prior Service Cost  (5) (15) (15) Net Loss  (934) (4,034) (9,836) Deferred Tax Expense  1,606 1,942 11,183 Other Comprehensive Gain, net of tax  $  (4,730) $  (5,719) $  (32,933) Amounts Recognized in Accumulated Other Comprehensive Loss:  Net Actuarial Losses  $  1,322 $  7,653 $  15,300 Prior Service Cost  - 5 20 Deferred Tax Benefit  (335) (1,941) (3,884) Accumulated Other Comprehensive Loss, net of tax  $  987 $  5,717 $  11,436 (1) | 
| Schedule of Pension Plan Asset Allocation and the Target Asset Allocation | Target  Percentage of Plan  Allocation  Assets at December 31 (1) 2024  2023  2022  Equity Securities  68 %  70 %  73 %  Debt Securities  27 %  18 %  23 %  Cash and Cash Equivalents  5 %  12 %  4 %  Total  100 %  100 %  100 % (1)  Represents asset allocation at December 31 which end cash contribution to the plan. | 
| Schedule of Fair Value of Plan Assets by Level of the Valuation Inputs within the Fair Value Hierarchy | (Dollars in Thousands)  2023  2022  Level 1:  U.S. Treasury Securities  $  16,126 $  17,264 Mutual Funds  92,991 81,231 Cash and Cash Equivalents  15,717 5,327 Level 2:  Corporate Notes/Bonds  461 454 Total Fair Value $  125,295 $  104,276 | 
| Schedule of Expected Benefit Payments Related to the Defined Benefit Pension Plan | Expected Benefit Payments. follows: (Dollars in Thousands)  2023  2024  $  10,105 2025  11,119 2026  10,496 2027  10,042 2028  8,983 2029 through 2033  45,942 Total  $  96,687 | 
| Schedule of Amounts Contributed to the Pension Plan and the Expected Amount to be Contributed | Expected  Contribution  (Dollars in Thousands)  2022  2023  2024 (1) Actual Contributions  $  - $  6,000 $  5,000 (1) | 
| Schedule of Components of SERP's Periodic Benefit Cost, the Funded Status of the Plan, Amounts Recognized in the Consolidated Statements of Financial Condition, and Major Assumptions | (Dollars in Thousands)  2023  2022  2021  Change in Projected Benefit Obligation:  Benefit Obligation at Beginning of Year  $  10,948 $  13,534 $  13,402 Service Cost  18 31 35 Interest Cost  501 315 243 Actuarial (Gain) Loss  201 (2,932) (146) Net Settlements  (2,464) - - Projected Benefit Obligation at End of Year  $  9,204 $  10,948 $  13,534 Funded Status of Plan and Accrued Liability Recognized at End of Year:  Other Liabilities  $  9,204 $  10,948 $  13,534 Accumulated Benefit Obligation at End of Year  $  8,943 $  10,887 $  12,803 Components of Net Periodic Benefit Costs:  Service Cost  $  18 $  31 $  35 Interest Cost  501 315 243 Amortization of Prior Service Cost  151 277 277 Net Loss Amortization  (531) 718 970 Net Gain Settlements  (291) - - Net Periodic Benefit Cost  $  (152) $  1,341 $  1,525 Weighted-Average Discount Rate  5.11% 5.45% 2.80% Rate of Compensation Increase (1) 5.10% 5.10% 4.40% Measurement Date  12/31/23 12/31/22 12/31/21 Weighted-Average Discount Rate  5.45% 2.80% 2.38% Rate of Compensation Increase (1) 5.10% 4.40% 4.00% Amortization Amounts from Accumulated Other Comprehensive Loss:  Net Actuarial Loss (Gain)  $  201 $  (2,932) $  (146) Prior Service (Benefit) Cost  (151) (277) (219) Net Gain (Loss)  531 (718) (970) Settlement Gain 291 - - Deferred Tax (Benefit) (222) 995 154 Other Comprehensive (Gain) Loss, net of tax  $  650 $  (2,932) $  (1,181) Amounts Recognized in Accumulated Other Comprehensive Loss:  Net Actuarial (Loss) Gain  $  (753) $  (1,775) $  1,875 Prior Service Cost  - 151 429 Deferred Tax Benefit 191 412 (584) Accumulated Other Comprehensive (Loss) Gain, net of tax  $  (562) $  (1,212) $  1,720 (1) | 
| Schedule of Expected Benefit Payments Related to the SERP | (Dollars in Thousands)  2023  2024  $  8,800 2025  32 2026  38 2027  42 2028  64 2029 through 2033  748 Total  $  9,724 |