Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	$ 507,751	$ 680,526
Available-for-sale, Less than 12 months, Unrealized Losses	(70,248)	(13,708)
Available-for-sale, 12 months or longer, Fair Value	677,083	186,350
Available-for-sale, 12 months or longer, Unrealized losses	(143,282)	(4,627)
Available-for-sale, Total Fair Value	1,184,834	866,876
Available-for-sale, Total Unrealized Losses	(213,530)	(18,335)
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	57,007	48,316
Available-for-sale, Less than 12 months, Unrealized Losses	(3,493)	(1,927)
Available-for-sale, 12 months or longer, Fair Value	163,520	139,846
Available-for-sale, 12 months or longer, Unrealized losses	(28,914)	(2,936)
Available-for-sale, Total Fair Value	220,527	188,162
Available-for-sale, Total Unrealized Losses	(32,407)	(4,863)
Obligations of States and Political Subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	220,102	61,535
Available-for-sale, Less than 12 months, Unrealized Losses	(43,221)	(657)
Available-for-sale, 12 months or longer, Fair Value	45,419	0
Available-for-sale, 12 months or longer, Unrealized losses	(16,624)	0
Available-for-sale, Total Fair Value	265,521	61,535
Available-for-sale, Total Unrealized Losses	(59,845)	(657)
Mortgage-backed Securities: GSE Residential
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	165,966	562,699
Available-for-sale, Less than 12 months, Unrealized Losses	(19,859)	(11,019)
Available-for-sale, 12 months or longer, Fair Value	461,446	46,504
Available-for-sale, 12 months or longer, Unrealized losses	(96,900)	(1,691)
Available-for-sale, Total Fair Value	627,412	609,203
Available-for-sale, Total Unrealized Losses	(116,759)	(12,710)
Other Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	64,676	7,976
Available-for-sale, Less than 12 months, Unrealized Losses	(3,675)	(105)
Available-for-sale, 12 months or longer, Fair Value	6,698	0
Available-for-sale, 12 months or longer, Unrealized losses	(844)	0
Available-for-sale, Total Fair Value	71,374	7,976
Available-for-sale, Total Unrealized Losses	$ (4,519)	$ (105)

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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), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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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), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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