Quarterly report [Sections 13 or 15(d)]

INVESTMENT SECURITIES (Unrealized Losses on Investment Securities) (Details)

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INVESTMENT SECURITIES (Unrealized Losses on Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Available-for-sale securities    
Less Than 12 Months, Fair Value $ 648,854 $ 97,158
Less Than 12 Months, Unrealized Losses 12,826 328
Greater Than 12 Months, Fair Value 178,989 225,632
Greater Than 12 Months, Unrealized Losses 18,158 14,305
Total Fair Value 827,843 322,790
Total Unrealized Losses 30,984 14,633
Held-to-maturity, Debt Securities    
Less Than 12 Months, Fair Value 201,991 33,589
Less Than 12 Months, Unrealized Losses 9,348 98
Greater Than 12 Months, Fair Value 91,838 235,530
Greater Than 12 Months, Unrealized Losses 11,962 8,958
Total Fair Value 293,829 269,119
Total Unrealized Losses 21,310 9,056
U.S. Government Treasury [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 591,355 31,319
Less Than 12 Months, Unrealized Losses 11,156 22
Greater Than 12 Months, Fair Value 2,988 8,902
Greater Than 12 Months, Unrealized Losses 15 149
Total Fair Value 594,343 40,221
Total Unrealized Losses 11,171 171
Held-to-maturity, Debt Securities    
Less Than 12 Months, Fair Value   0
Less Than 12 Months, Unrealized Losses   0
Greater Than 12 Months, Fair Value   129,268
Greater Than 12 Months, Unrealized Losses   514
Total Fair Value   129,268
Total Unrealized Losses   514
U.S. Government Agency [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 54,953 62,809
Less Than 12 Months, Unrealized Losses 1,648 182
Greater Than 12 Months, Fair Value 74,492 91,760
Greater Than 12 Months, Unrealized Losses 2,447 2,302
Total Fair Value 129,445 154,569
Total Unrealized Losses 4,095 2,484
States and Political Subdivisions [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 1,842 3,030
Less Than 12 Months, Unrealized Losses 21 124
Greater Than 12 Months, Fair Value 28,453 30,705
Greater Than 12 Months, Unrealized Losses 2,408 1,921
Total Fair Value 30,295 33,735
Total Unrealized Losses 2,429 2,045
Mortgage-Backed Securities [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 47 0
Less Than 12 Months, Unrealized Losses 1 0
Greater Than 12 Months, Fair Value 44,274 51,932
Greater Than 12 Months, Unrealized Losses 10,714 7,697
Total Fair Value 44,321 51,932
Total Unrealized Losses 10,715 7,697
Held-to-maturity, Debt Securities    
Less Than 12 Months, Fair Value 201,991 33,589
Less Than 12 Months, Unrealized Losses 9,348 98
Greater Than 12 Months, Fair Value 91,838 106,262
Greater Than 12 Months, Unrealized Losses 11,962 8,444
Total Fair Value 293,829 139,851
Total Unrealized Losses 21,310 8,542
Corporate Debt Securities [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 657 0
Less Than 12 Months, Unrealized Losses 0 0
Greater Than 12 Months, Fair Value 28,782 42,333
Greater Than 12 Months, Unrealized Losses 2,574 2,236
Total Fair Value 29,439 42,333
Total Unrealized Losses $ 2,574 $ 2,236