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Securities - Unrealized Losses on Available-for-Sale of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Fair Value    
Less than 12 Months $ 138,367 $ 428,669
12 Months or Longer 1,439,437 1,160,723
Total 1,577,804 1,589,392
Unrealized Losses    
Less than 12 Months 3,181 30,152
12 Months or Longer 206,413 206,692
Total 209,594 236,844
U.S. Treasuries    
Fair Value    
Less than 12 Months 0 28,602
12 Months or Longer 170,814 138,649
Total 170,814 167,251
Unrealized Losses    
Less than 12 Months 0 2,132
12 Months or Longer 19,406 20,787
Total 19,406 22,919
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 95,536 143,794
12 Months or Longer 504,226 457,373
Total 599,762 601,167
Unrealized Losses    
Less than 12 Months 1,931 7,508
12 Months or Longer 69,286 72,517
Total 71,217 80,025
Obligations of U.S. states and political subdivisions    
Fair Value    
Less than 12 Months 20,397 46,638
12 Months or Longer 58,598 33,435
Total 78,995 80,073
Unrealized Losses    
Less than 12 Months 306 2,385
12 Months or Longer 5,936 5,941
Total 6,242 8,326
U.S. Government agencies    
Fair Value    
Less than 12 Months 5,484 22,945
12 Months or Longer 45,046 29,356
Total 50,530 52,301
Unrealized Losses    
Less than 12 Months 183 1,258
12 Months or Longer 5,164 4,813
Total 5,347 6,071
U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 16,950 186,690
12 Months or Longer 658,360 499,532
Total 675,310 686,222
Unrealized Losses    
Less than 12 Months 761 16,869
12 Months or Longer 106,514 102,512
Total 107,275 119,381
U.S. corporate debt securities    
Fair Value    
Less than 12 Months 0 0
12 Months or Longer 2,393 2,378
Total 2,393 2,378
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Longer 107 122
Total $ 107 $ 122