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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Securities [Abstract]
Percentage of total investment with unrealized losses	95.90%	97.30%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 20,968	$ 35,971
12 months or more	1,167,250	1,234,191
Total	1,188,218	1,270,162
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(413)	(1,544)
12 months or more	(142,605)	(136,221)
Total	(143,018)	(137,765)
Available-for-sale, fair value [Abstract]
Less than 12 months	20,555	34,427
12 months or more	1,024,645	1,097,970
Total	1,045,200	1,132,397
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	0	3,761
12 months or more	351,496	361,038
Total	351,496	364,799
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	0	(5)
12 months or more	(25,844)	(26,567)
Total	(25,844)	(26,572)
Available-for-sale, fair value [Abstract]
Less than 12 months	0	3,756
12 months or more	325,652	334,471
Total	325,652	338,227
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	11,334	16,154
12 months or more	298,440	284,397
Total	309,774	300,551
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(343)	(1,250)
12 months or more	(52,139)	(47,040)
Total	(52,482)	(48,290)
Available-for-sale, fair value [Abstract]
Less than 12 months	10,991	14,904
12 months or more	246,301	237,357
Total	257,292	252,261
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	7,686	16,056
12 months or more	456,874	500,763
Total	464,560	516,819
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(65)	(289)
12 months or more	(64,412)	(61,847)
Total	(64,477)	(62,136)
Available-for-sale, fair value [Abstract]
Less than 12 months	7,621	15,767
12 months or more	392,462	438,916
Total	400,083	454,683
Asset-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	1,948	0
12 months or more	60,440	87,993
Total	62,388	87,993
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(5)	0
12 months or more	(210)	(767)
Total	(215)	(767)
Available-for-sale, fair value [Abstract]
Less than 12 months	1,943	0
12 months or more	60,230	87,226
Total	$ 62,173	$ 87,226

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