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SECURITIES - Unrealized Loss on Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
AVAILABLE FOR SALE    
Less than 12 Months, fair value $ 185,339 $ 1,174,855
Less than 12 Months, unrealized loss 1,165 82,638
More than 12 Months, fair value 560,939 29,165
More than 12 Months, unrealized loss 38,666 7,504
Total fair value 746,278 1,204,020
Total unrealized loss 39,831 90,142
HELD TO MATURITY    
Less than 12 months, fair value 26,505 672,739
Less than 12 Months, unrealized loss 1,258 83,876
More than 12 months, fair value 939,087 340,055
More than 12 Months, unrealized loss 150,204 98,262
Total fair value 965,592 1,012,794
Total unrealized loss 151,462 182,138
State and Political Subdivisions    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 26,371 859,270
Less than 12 Months, unrealized loss 297 68,683
More than 12 Months, fair value 516,520 26,620
More than 12 Months, unrealized loss 35,233 6,874
Total fair value 542,891 885,890
Total unrealized loss 35,530 75,557
HELD TO MATURITY    
Less than 12 months, fair value 16,549 426,382
Less than 12 Months, unrealized loss 123 66,898
More than 12 months, fair value 713,499 323,385
More than 12 Months, unrealized loss 126,110 96,385
Total fair value 730,048 749,767
Total unrealized loss 126,233 163,283
Corporate bonds and other    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 8,103 3,678
Less than 12 Months, unrealized loss 319 14
More than 12 Months, fair value 5,071 0
More than 12 Months, unrealized loss 188 0
Total fair value 13,174 3,678
Total unrealized loss 507 14
HELD TO MATURITY    
Less than 12 months, fair value 9,956 125,250
Less than 12 Months, unrealized loss 1,135 6,660
More than 12 months, fair value 114,787 12,738
More than 12 Months, unrealized loss 14,603 1,333
Total fair value 124,743 137,988
Total unrealized loss 15,738 7,993
Residential    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 150,865 306,294
Less than 12 Months, unrealized loss 549 13,623
More than 12 Months, fair value 36,864 0
More than 12 Months, unrealized loss 2,709 0
Total fair value 187,729 306,294
Total unrealized loss 3,258 13,623
HELD TO MATURITY    
Less than 12 months, fair value 0 80,801
Less than 12 Months, unrealized loss 0 7,799
More than 12 months, fair value 82,747 3,932
More than 12 Months, unrealized loss 7,263 544
Total fair value 82,747 84,733
Total unrealized loss 7,263 8,343
Commercial    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 0 5,613
Less than 12 Months, unrealized loss 0 318
More than 12 Months, fair value 2,484 2,545
More than 12 Months, unrealized loss 536 630
Total fair value 2,484 8,158
Total unrealized loss 536 948
HELD TO MATURITY    
Less than 12 months, fair value 0 40,306
Less than 12 Months, unrealized loss 0 2,519
More than 12 months, fair value 28,054 0
More than 12 Months, unrealized loss 2,228 0
Total fair value 28,054 40,306
Total unrealized loss $ 2,228 $ 2,519