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SECURITIES - Unrealized Loss on Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
AVAILABLE FOR SALE    
Less than 12 Months, fair value $ 1,174,855 $ 311,552
Less than 12 Months, unrealized loss 82,638 3,891
More than 12 Months, fair value 29,165 17,450
More than 12 Months, unrealized loss 7,504 1,059
Total fair value 1,204,020 329,002
Total unrealized loss 90,142 4,950
HELD TO MATURITY    
Less than 12 months, fair value 672,739  
Less than 12 Months, unrealized loss 83,876  
More than 12 months, fair value 340,055  
More than 12 Months, unrealized loss 98,262  
Total fair value 1,012,794  
Total unrealized loss 182,138  
US Treasury Securities    
AVAILABLE FOR SALE    
Less than 12 Months, fair value   9,947
Less than 12 Months, unrealized loss   50
More than 12 Months, fair value   0
More than 12 Months, unrealized loss   0
Total fair value   9,947
Total unrealized loss   50
State and Political Subdivisions    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 859,270 260,509
Less than 12 Months, unrealized loss 68,683 3,622
More than 12 Months, fair value 26,620 7,608
More than 12 Months, unrealized loss 6,874 592
Total fair value 885,890 268,117
Total unrealized loss 75,557 4,214
HELD TO MATURITY    
Less than 12 months, fair value 426,382  
Less than 12 Months, unrealized loss 66,898  
More than 12 months, fair value 323,385  
More than 12 Months, unrealized loss 96,385  
Total fair value 749,767  
Total unrealized loss 163,283  
Corporate bonds and other    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 3,678 35,597
Less than 12 Months, unrealized loss 14 209
More than 12 Months, fair value 0 0
More than 12 Months, unrealized loss 0 0
Total fair value 3,678 35,597
Total unrealized loss 14 209
HELD TO MATURITY    
Less than 12 months, fair value 125,250  
Less than 12 Months, unrealized loss 6,660  
More than 12 months, fair value 12,738  
More than 12 Months, unrealized loss 1,333  
Total fair value 137,988  
Total unrealized loss 7,993  
Residential    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 306,294 1,225
Less than 12 Months, unrealized loss 13,623 3
More than 12 Months, fair value 0 5,168
More than 12 Months, unrealized loss 0 269
Total fair value 306,294 6,393
Total unrealized loss 13,623 272
HELD TO MATURITY    
Less than 12 months, fair value 80,801  
Less than 12 Months, unrealized loss 7,799  
More than 12 months, fair value 3,932  
More than 12 Months, unrealized loss 544  
Total fair value 84,733  
Total unrealized loss 8,343  
Commercial    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 5,613 4,274
Less than 12 Months, unrealized loss 318 7
More than 12 Months, fair value 2,545 4,674
More than 12 Months, unrealized loss 630 198
Total fair value 8,158 8,948
Total unrealized loss 948 $ 205
HELD TO MATURITY    
Less than 12 months, fair value 40,306  
Less than 12 Months, unrealized loss 2,519  
More than 12 months, fair value 0  
More than 12 Months, unrealized loss 0  
Total fair value 40,306  
Total unrealized loss $ 2,519