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SECURITIES - Schedule of Debt Securities Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
AVAILABLE FOR SALE:    
Amortized cost $ 1,587,416 $ 1,332,467
Gross unrealized gain 1,210 3,658
Gross unrealized loss 54,732 39,831
Securities available for sale, at estimated fair value 1,533,894 1,296,294
HELD TO MATURITY:    
Amortized Cost 1,279,234 1,307,053
Gross unrealized gains 4,029 10,571
Gross unrealized losses 169,781 151,462
Estimated fair value 1,113,482 1,166,162
US Treasury Securities    
AVAILABLE FOR SALE:    
Amortized cost 173,880 139,706
Gross unrealized gain 76 19
Gross unrealized loss 0 0
Securities available for sale, at estimated fair value 173,956 139,725
State and Political Subdivisions    
AVAILABLE FOR SALE:    
Amortized cost 458,013 603,913
Gross unrealized gain 36 362
Gross unrealized loss 43,717 35,530
Securities available for sale, at estimated fair value 414,332 568,745
HELD TO MATURITY:    
Amortized Cost 1,040,912 1,039,440
Gross unrealized gains 4,004 10,070
Gross unrealized losses 152,697 126,233
Estimated fair value 892,219 923,277
Corporate bonds and other    
AVAILABLE FOR SALE:    
Amortized cost 14,646 14,569
Gross unrealized gain 263 31
Gross unrealized loss 401 507
Securities available for sale, at estimated fair value 14,508 14,093
HELD TO MATURITY:    
Amortized Cost 124,095 146,712
Gross unrealized gains 17 488
Gross unrealized losses 6,553 15,738
Estimated fair value 117,559 131,462
Residential    
AVAILABLE FOR SALE:    
Amortized cost [1] 935,639 569,039
Gross unrealized gain [1] 835 3,202
Gross unrealized loss [1] 10,088 3,258
Securities available for sale, at estimated fair value [1] 926,386 568,983
HELD TO MATURITY:    
Amortized Cost [1] 84,660 90,619
Gross unrealized gains [1] 8 13
Gross unrealized losses [1] 8,549 7,263
Estimated fair value [1] 76,119 83,369
Commercial    
AVAILABLE FOR SALE:    
Amortized cost [1] 5,238 5,240
Gross unrealized gain [1] 0 44
Gross unrealized loss [1] 526 536
Securities available for sale, at estimated fair value [1] 4,712 4,748
HELD TO MATURITY:    
Amortized Cost [1] 29,567 30,282
Gross unrealized gains [1] 0 0
Gross unrealized losses [1] 1,982 2,228
Estimated fair value [1] $ 27,585 $ 28,054
[1] All MBS issued and/or guaranteed by U.S. government agencies or U.S. GSEs.