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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	$ 74,007	$ 507,751
Available-for-sale, Less than 12 months, Unrealized Losses	(2,349)	(70,248)
Available-for-sale, 12 months or longer, Fair Value	1,099,203	677,083
Available-for-sale, 12 months or longer, Unrealized losses	(192,066)	(143,282)
Available-for-sale, Total Fair Value	1,173,210	1,184,834
Available-for-sale, Total Unrealized Losses	(194,415)	(213,530)
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	1,757	57,007
Available-for-sale, Less than 12 months, Unrealized Losses	(19)	(3,493)
Available-for-sale, 12 months or longer, Fair Value	220,714	163,520
Available-for-sale, 12 months or longer, Unrealized losses	(29,669)	(28,914)
Available-for-sale, Total Fair Value	222,471	220,527
Available-for-sale, Total Unrealized Losses	(29,688)	(32,407)
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	45,880	220,102
Available-for-sale, Less than 12 months, Unrealized Losses	(1,204)	(43,221)
Available-for-sale, 12 months or longer, Fair Value	212,715	45,419
Available-for-sale, 12 months or longer, Unrealized losses	(53,765)	(16,624)
Available-for-sale, Total Fair Value	258,595	265,521
Available-for-sale, Total Unrealized Losses	(54,969)	(59,845)
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	12,887	165,966
Available-for-sale, Less than 12 months, Unrealized Losses	(589)	(19,859)
Available-for-sale, 12 months or longer, Fair Value	610,896	461,446
Available-for-sale, 12 months or longer, Unrealized losses	(105,178)	(96,900)
Available-for-sale, Total Fair Value	623,783	627,412
Available-for-sale, Total Unrealized Losses	(105,767)	(116,759)
Other Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	13,483	64,676
Available-for-sale, Less than 12 months, Unrealized Losses	(537)	(3,675)
Available-for-sale, 12 months or longer, Fair Value	54,878	6,698
Available-for-sale, 12 months or longer, Unrealized losses	(3,454)	(844)
Available-for-sale, Total Fair Value	68,361	71,374
Available-for-sale, Total Unrealized Losses	$ (3,991)	$ (4,519)

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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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