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SECURITIES - Schedule of Debt Securities Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
AVAILABLE FOR SALE:    
Amortized cost $ 1,332,467 $ 1,387,874
Gross unrealized gain 3,658 1,282
Gross unrealized loss 39,831 90,142
Securities available for sale, at estimated fair value 1,296,294 1,299,014
HELD TO MATURITY:    
Amortized Cost 1,307,053 1,326,729
Gross unrealized gains 10,571 4,565
Gross unrealized losses 151,462 182,138
Estimated fair value 1,166,162 1,149,156
US Treasury Securities    
AVAILABLE FOR SALE:    
Amortized cost 139,706  
Gross unrealized gain 19  
Gross unrealized loss 0  
Securities available for sale, at estimated fair value 139,725  
State and Political Subdivisions    
AVAILABLE FOR SALE:    
Amortized cost 603,913 1,039,453
Gross unrealized gain 362 956
Gross unrealized loss 35,530 75,557
Securities available for sale, at estimated fair value 568,745 964,852
HELD TO MATURITY:    
Amortized Cost 1,039,440 1,037,556
Gross unrealized gains 10,070 3,969
Gross unrealized losses 126,233 163,283
Estimated fair value 923,277 878,242
Corporate bonds and other    
AVAILABLE FOR SALE:    
Amortized cost 14,569 8,692
Gross unrealized gain 31 26
Gross unrealized loss 507 14
Securities available for sale, at estimated fair value 14,093 8,704
HELD TO MATURITY:    
Amortized Cost 146,712 152,552
Gross unrealized gains 488 575
Gross unrealized losses 15,738 7,993
Estimated fair value 131,462 145,134
Residential    
AVAILABLE FOR SALE:    
Amortized cost [1] 569,039 328,400
Gross unrealized gain [1] 3,202 250
Gross unrealized loss [1] 3,258 13,623
Securities available for sale, at estimated fair value [1] 568,983 315,027
HELD TO MATURITY:    
Amortized Cost [1] 90,619 93,796
Gross unrealized gains [1] 13 21
Gross unrealized losses [1] 7,263 8,343
Estimated fair value [1] 83,369 85,474
Commercial    
AVAILABLE FOR SALE:    
Amortized cost [1] 5,240 11,329
Gross unrealized gain [1] 44 50
Gross unrealized loss [1] 536 948
Securities available for sale, at estimated fair value [1] 4,748 10,431
HELD TO MATURITY:    
Amortized Cost [1] 30,282 42,825
Gross unrealized gains [1] 0 0
Gross unrealized losses [1] 2,228 2,519
Estimated fair value [1] $ 28,054 $ 40,306
[1] All MBS issued and/or guaranteed by U.S. government agencies or U.S. GSEs.