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Securities - Unrealized Losses on Available-for-Sale of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value    
Less than 12 Months $ 1,082,342 $ 1,095,830
12 Months or Longer 698,688 394,300
Total 1,781,030 1,490,130
Unrealized Losses    
Less than 12 Months 60,958 20,921
12 Months or Longer 66,090 11,982
Total 127,048 32,903
U.S. Treasuries    
Fair Value    
Less than 12 Months 174,290 147,810
12 Months or Longer 4,613 0
Total 178,903 147,810
Unrealized Losses    
Less than 12 Months 11,756 2,542
12 Months or Longer 338 0
Total 12,094 2,542
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 269,829 362,895
12 Months or Longer 394,741 289,210
Total 664,570 652,105
Unrealized Losses    
Less than 12 Months 18,755 6,694
12 Months or Longer 32,769 8,678
Total 51,524 15,372
Obligations of U.S. states and political subdivisions    
Fair Value    
Less than 12 Months 65,155 9,700
12 Months or Longer 3,378 1,283
Total 68,533 10,983
Unrealized Losses    
Less than 12 Months 4,291 85
12 Months or Longer 487 15
Total 4,778 100
U.S. Government agencies    
Fair Value    
Less than 12 Months 30,557 22,074
12 Months or Longer 17,796 16,846
Total 48,353 38,920
Unrealized Losses    
Less than 12 Months 996 160
12 Months or Longer 1,319 372
Total 2,315 532
U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 542,511 553,351
12 Months or Longer 275,733 84,537
Total 818,244 637,888
Unrealized Losses    
Less than 12 Months 25,160 11,440
12 Months or Longer 31,104 2,841
Total 56,264 14,281
U.S. corporate debt securities    
Fair Value    
Less than 12 Months 0 0
12 Months or Longer 2,427 2,424
Total 2,427 2,424
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Longer 73 76
Total $ 73 $ 76