Securities - Unrealized Losses on Available-for-Sale of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value
Less than 12 Months	$ 428,669	$ 1,095,830
12 Months or Longer	1,160,723	394,300
Total	1,589,392	1,490,130
Unrealized Losses
Less than 12 Months	30,152	20,921
12 Months or Longer	206,692	11,982
Total	236,844	32,903
U.S. Treasuries
Fair Value
Less than 12 Months	28,602	147,810
12 Months or Longer	138,649	0
Total	167,251	147,810
Unrealized Losses
Less than 12 Months	2,132	2,542
12 Months or Longer	20,787	0
Total	22,919	2,542
Obligations of U.S. Government sponsored entities
Fair Value
Less than 12 Months	143,794	362,895
12 Months or Longer	457,373	289,210
Total	601,167	652,105
Unrealized Losses
Less than 12 Months	7,508	6,694
12 Months or Longer	72,517	8,678
Total	80,025	15,372
Obligations of U.S. states and political subdivisions
Fair Value
Less than 12 Months	46,638	9,700
12 Months or Longer	33,435	1,283
Total	80,073	10,983
Unrealized Losses
Less than 12 Months	2,385	85
12 Months or Longer	5,941	15
Total	8,326	100
U.S. Government agencies
Fair Value
Less than 12 Months	22,945	22,074
12 Months or Longer	29,356	16,846
Total	52,301	38,920
Unrealized Losses
Less than 12 Months	1,258	160
12 Months or Longer	4,813	372
Total	6,071	532
U.S. Government sponsored entities
Fair Value
Less than 12 Months	186,690	553,351
12 Months or Longer	499,532	84,537
Total	686,222	637,888
Unrealized Losses
Less than 12 Months	16,869	11,440
12 Months or Longer	102,512	2,841
Total	119,381	14,281
U.S. corporate debt securities
Fair Value
Less than 12 Months	0	0
12 Months or Longer	2,378	2,424
Total	2,378	2,424
Unrealized Losses
Less than 12 Months	0	0
12 Months or Longer	122	76
Total	$ 122	$ 76