Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	$ 649,457,000	$ 680,526,000
Available-for-sale, Less than 12 months, Unrealized Losses	(110,127,000)	(13,708,000)
Available-for-sale, 12 months or longer, Fair Value	554,983,000	186,350,000
Available-for-sale, 12 months or longer, Unrealized losses	(126,058,000)	(4,627,000)
Available-for-sale, Total Fair Value	1,204,440,000	866,876,000
Available-for-sale, Total Unrealized Losses	(236,185,000)	(18,335,000)
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	89,341,000	48,316,000
Available-for-sale, Less than 12 months, Unrealized Losses	(8,618,000)	(1,927,000)
Available-for-sale, 12 months or longer, Fair Value	132,392,000	139,846,000
Available-for-sale, 12 months or longer, Unrealized losses	(25,129,000)	(2,936,000)
Available-for-sale, Total Fair Value	221,733,000	188,162,000
Available-for-sale, Total Unrealized Losses	(33,747,000)	(4,863,000)
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	235,842,000	61,535,000
Available-for-sale, Less than 12 months, Unrealized Losses	(57,209,000)	(657,000)
Available-for-sale, 12 months or longer, Fair Value	37,212,000	0
Available-for-sale, 12 months or longer, Unrealized losses	(17,340,000)	0
Available-for-sale, Total Fair Value	273,054,000	61,535,000
Available-for-sale, Total Unrealized Losses	(74,549,000)	(657,000)
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	260,199,000	562,699,000
Available-for-sale, Less than 12 months, Unrealized Losses	(40,477,000)	(11,019,000)
Available-for-sale, 12 months or longer, Fair Value	379,400,000	46,504,000
Available-for-sale, 12 months or longer, Unrealized losses	(83,018,000)	(1,691,000)
Available-for-sale, Total Fair Value	639,599,000	609,203,000
Available-for-sale, Total Unrealized Losses	(123,495,000)	(12,710,000)
Other Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	64,075,000	7,976,000
Available-for-sale, Less than 12 months, Unrealized Losses	(3,823,000)	(105,000)
Available-for-sale, 12 months or longer, Fair Value	5,979,000	0
Available-for-sale, 12 months or longer, Unrealized losses	(571,000)	0
Available-for-sale, Total Fair Value	70,054,000	7,976,000
Available-for-sale, Total Unrealized Losses	$ (4,394,000)	$ (105,000)

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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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-Publisher FASB
-Name Accounting Standards Codification
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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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