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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Securities [Abstract]
Percentage of total investment with unrealized losses	97.40%	72.40%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 416,778	$ 973,642
12 months or more	981,280	97,329
Total	1,398,058	1,070,971
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(21,324)	(15,851)
12 months or more	(153,300)	(1,832)
Total	(174,624)	(17,683)
Available-for-sale, fair value [Abstract]
Less than 12 months	395,454	957,791
12 months or more	827,980	95,497
Total	1,223,434	1,053,288
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	144,305	249,990
12 months or more	249,424	14,505
Total	393,729	264,495
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(6,953)	(4,123)
12 months or more	(29,906)	(64)
Total	(36,859)	(4,187)
Available-for-sale, fair value [Abstract]
Less than 12 months	137,352	245,867
12 months or more	219,518	14,441
Total	356,870	260,308
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	94,277	197,592
12 months or more	225,019	19,126
Total	319,296	216,718
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(6,257)	(4,779)
12 months or more	(55,419)	(760)
Total	(61,676)	(5,539)
Available-for-sale, fair value [Abstract]
Less than 12 months	88,020	192,813
12 months or more	169,600	18,366
Total	257,620	211,179
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	139,314	473,831
12 months or more	454,357	62,330
Total	593,671	536,161
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(6,883)	(6,759)
12 months or more	(66,950)	(1,006)
Total	(73,833)	(7,765)
Available-for-sale, fair value [Abstract]
Less than 12 months	132,431	467,072
12 months or more	387,407	61,324
Total	519,838	528,396
Asset-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	38,882	52,229
12 months or more	52,480	1,368
Total	91,362	53,597
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(1,231)	(190)
12 months or more	(1,025)	(2)
Total	(2,256)	(192)
Available-for-sale, fair value [Abstract]
Less than 12 months	37,651	52,039
12 months or more	51,455	1,366
Total	$ 89,106	$ 53,405

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