Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS - SERP changes in benefit obligation, the funded status of the plan, components of pension expense (Details)

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EMPLOYEE BENEFIT PLANS - SERP changes in benefit obligation, the funded status of the plan, components of pension expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in Projected Benefit Obligation:      
Actuarial Loss (Gain) $ 27,924,000 $ 7,642,000 $ 815,000
Supplemental Executive Retirement Plan ("SERP") [Member]      
Change in Projected Benefit Obligation:      
Benefit Obligation at Beginning of Year 10,244,000 8,860,000 7,285,000
Service Cost 31,000 0 0
Interest Cost 321,000 349,000 227,000
Actuarial Loss (Gain) 1,826,000 1,035,000 1,348,000
Plan Amendments 980,000 0 0
Projected Benefit Obligation at End of Year 13,402,000 10,244,000 8,860,000
Funded Status of Plan and Accrued Liability Recognized at End of Year:      
Other Liabilities 13,402,000 10,244,000 8,860,000
Accumulated Benefit Obligation at End of Year 12,339,000 8,778,000 7,557,000
Components of Net Periodic Benefit Costs:      
Service Cost 31,000 0 0
Interest Cost 321,000 349,000 227,000
Amortization of Prior Service Cost 327,000 0 0
Net Loss Amortization 503,000 761,000 1,626,000
Net Periodic Benefit Cost $ 1,182,000 $ 1,110,000 $ 1,853,000
Weighted-average used to determine the benefit obligations:      
Discount Rate (in percent) 2.38% 3.16% 4.23%
Rate of Compensation Increase (in percent) 4.00% 4.00% 4.00%
Measurement Date Dec. 31, 2020 Dec. 31, 2019 Dec. 31, 2018
Weighted-Average Assumptions Used to Determine Benefit Cost:      
Discount Rate (in percent) 3.16% 4.23% 3.53%
Rate of Compensation Increase (in percent) 3.50% 3.50% 3.25%
Amortization Amounts from Accumulated Other Comprehensive Income:      
Net Actuarial Loss (Gain) $ 1,826,000 $ 1,035,000 $ 1,348,000
Prior Service Cost 895,000 0 0
Net Loss (458,000) (761,000) (1,626,000)
Deferred Tax (Benefit) Expense (573,000) (70,000) 71,000
Other Comprehensive Loss (Gain), net of tax 1,690,000 204,000 (207,000)
Amounts Recognized in Accumulated Other Comprehensive Income:      
Net Actuarial Loss (2,991,000) (1,622,000) 1,348,000
Prior Service Cost 895,000 0 0
Deferred Tax Liability (Benefit) (985,000) (411,000) (341,000)
Accumulated Other Comprehensive Loss (Gain), net of tax $ 2,901,000 $ 1,211,000 $ 1,007,000