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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale: [Abstract]
Amortized Cost	$ 1,406,923	$ 1,432,372
Gross Unrealized Gains	190	143
Gross Unrealized (Losses)	(194,415)	(213,530)
Fair Value	1,212,698	1,218,985
Held-to-maturity: [Abstract]
Held-to-maturity	2,979	2,954
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	2,979	2,954
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	253,228	252,934
Gross Unrealized Gains	5	0
Gross Unrealized (Losses)	(29,688)	(32,407)
Fair Value	223,545	220,527
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	339,808	347,409
Gross Unrealized Gains	158	134
Gross Unrealized (Losses)	(54,969)	(59,845)
Fair Value	284,997	287,698
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	730,036	744,636
Gross Unrealized Gains	3	3
Gross Unrealized (Losses)	(105,767)	(116,759)
Fair Value	624,272	627,880
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	83,851	87,393
Gross Unrealized Gains	24	6
Gross Unrealized (Losses)	(3,991)	(4,519)
Fair Value	79,884	82,880
Other Investments
Held-to-maturity: [Abstract]
Held-to-maturity	2,979	2,954
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	$ 2,979	$ 2,954

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