Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale: [Abstract]
Amortized Cost	$ 1,432,372	$ 1,422,591
Gross Unrealized Gains	143	17,166
Gross Unrealized (Losses)	(213,530)	(18,335)
Fair Value	1,218,985	1,421,422
Held-to-maturity: [Abstract]
Held-to-maturity	2,954	7,030
Gross Unrealized Gains	0	5
Unrealized (Losses)	0	0
Fair Value	2,954	7,035
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	252,934	208,598
Gross Unrealized Gains	0	80
Gross Unrealized (Losses)	(32,407)	(4,863)
Fair Value	220,527	203,815
Held-to-maturity: [Abstract]
Held-to-maturity		5,001
Gross Unrealized Gains		5
Unrealized (Losses)		0
Fair Value		5,006
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	347,409	383,991
Gross Unrealized Gains	134	12,123
Gross Unrealized (Losses)	(59,845)	(657)
Fair Value	287,698	395,457
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	744,636	799,456
Gross Unrealized Gains	3	4,292
Gross Unrealized (Losses)	(116,759)	(12,710)
Fair Value	627,880	791,038
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	87,393	30,546
Gross Unrealized Gains	6	671
Gross Unrealized (Losses)	(4,519)	(105)
Fair Value	82,880	31,112
Held-to-maturity: [Abstract]
Held-to-maturity	2,954	2,029
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	$ 2,954	$ 2,029

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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