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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Securities [Abstract]
Percentage of total investment with unrealized losses	93.20%	72.40%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 1,084,049	$ 973,642
12 months or more	355,613	97,329
Total	1,439,662	1,070,971
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(90,130)	(15,851)
12 months or more	(42,530)	(1,832)
Total	(132,660)	(17,683)
Available-for-sale, fair value [Abstract]
Less than 12 months	993,919	957,791
12 months or more	313,083	95,497
Total	1,307,002	1,053,288
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	382,012	249,990
12 months or more	44,913	14,505
Total	426,925	264,495
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(23,320)	(4,123)
12 months or more	(4,189)	(64)
Total	(27,509)	(4,187)
Available-for-sale, fair value [Abstract]
Less than 12 months	358,692	245,867
12 months or more	40,724	14,441
Total	399,416	260,308
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	204,981	197,592
12 months or more	99,653	19,126
Total	304,634	216,718
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(28,227)	(4,779)
12 months or more	(21,633)	(760)
Total	(49,860)	(5,539)
Available-for-sale, fair value [Abstract]
Less than 12 months	176,754	192,813
12 months or more	78,020	18,366
Total	254,774	211,179
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	449,017	473,831
12 months or more	165,619	62,330
Total	614,636	536,161
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(37,182)	(6,759)
12 months or more	(15,698)	(1,006)
Total	(52,880)	(7,765)
Available-for-sale, fair value [Abstract]
Less than 12 months	411,835	467,072
12 months or more	149,921	61,324
Total	561,756	528,396
Asset-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	48,039	52,229
12 months or more	45,428	1,368
Total	93,467	53,597
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(1,401)	(190)
12 months or more	(1,010)	(2)
Total	(2,411)	(192)
Available-for-sale, fair value [Abstract]
Less than 12 months	46,638	52,039
12 months or more	44,418	1,366
Total	$ 91,056	$ 53,405

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