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Securities - Unrealized Loss on Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
AVAILABLE FOR SALE    
Less than 12 Months, fair value $ 287,599 $ 1,174,855
Less than 12 Months, unrealized loss 9,869 82,638
More than 12 Months, fair value 791,623 29,165
More than 12 Months, unrealized Loss 127,464 7,504
Total fair value 1,079,222 1,204,020
Total unrealized loss 137,333 90,142
HELD TO MATURITY    
Less than 12 months, fair value 200,330 672,739
Less than 12 months, unrealized loss 14,978 83,876
More than 12 months, fair value 845,470 340,055
More than 12 months, unrealized loss 240,792 98,262
Total fair value 1,045,800 1,012,794
Total unrealized loss 255,770 182,138
State and political subdivisions    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 115,067 859,270
Less than 12 Months, unrealized loss 6,434 68,683
More than 12 Months, fair value 591,566 26,620
More than 12 Months, unrealized Loss 107,790 6,874
Total fair value 706,633 885,890
Total unrealized loss 114,224 75,557
HELD TO MATURITY    
Less than 12 months, fair value 186,212 426,382
Less than 12 months, unrealized loss 13,551 66,898
More than 12 months, fair value 626,801 323,385
More than 12 months, unrealized loss 212,370 96,385
Total fair value 813,013 749,767
Total unrealized loss 225,921 163,283
Corporate bonds and other    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 12,500 3,678
Less than 12 Months, unrealized loss 1,166 14
More than 12 Months, fair value 689 0
More than 12 Months, unrealized Loss 7 0
Total fair value 13,189 3,678
Total unrealized loss 1,173 14
HELD TO MATURITY    
Less than 12 months, fair value 13,595 125,250
Less than 12 months, unrealized loss 1,425 6,660
More than 12 months, fair value 111,451 12,738
More than 12 months, unrealized loss 13,855 1,333
Total fair value 125,046 137,988
Total unrealized loss 15,280 7,993
Residential    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 157,854 306,294
Less than 12 Months, unrealized loss 2,226 13,623
More than 12 Months, fair value 191,521 0
More than 12 Months, unrealized Loss 18,635 0
Total fair value 349,375 306,294
Total unrealized loss 20,861 13,623
HELD TO MATURITY    
Less than 12 months, fair value 523 80,801
Less than 12 months, unrealized loss 2 7,799
More than 12 months, fair value 80,024 3,932
More than 12 months, unrealized loss 11,303 544
Total fair value 80,547 84,733
Total unrealized loss 11,305 8,343
Commercial    
AVAILABLE FOR SALE    
Less than 12 Months, fair value 2,178 5,613
Less than 12 Months, unrealized loss 43 318
More than 12 Months, fair value 7,847 2,545
More than 12 Months, unrealized Loss 1,032 630
Total fair value 10,025 8,158
Total unrealized loss 1,075 948
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 27,194 0
More than 12 months, unrealized loss 3,264 0
Total fair value 27,194 40,306
Total unrealized loss $ 3,264 $ 2,519