Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	$ 680,526,000	$ 126,177,000
Available-for-sale, Less than 12 months, Unrealized Losses	(13,708,000)	(998,000)
Available-for-sale, 12 months or longer, Fair Value	186,350,000	2,377,000
Available-for-sale, 12 months or longer, Unrealized losses	(4,627,000)	0
Available-for-sale, Total Fair Value	866,876,000	128,554,000
Available-for-sale, Total Unrealized Losses	(18,335,000)	(998,000)
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	48,316,000	59,211,000
Available-for-sale, Less than 12 months, Unrealized Losses	(1,927,000)	(788,000)
Available-for-sale, 12 months or longer, Fair Value	139,846,000	0
Available-for-sale, 12 months or longer, Unrealized losses	(2,936,000)	0
Available-for-sale, Total Fair Value	188,162,000	59,211,000
Available-for-sale, Total Unrealized Losses	(4,863,000)	(788,000)
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	61,535,000	5,380,000
Available-for-sale, Less than 12 months, Unrealized Losses	(657,000)	(37,000)
Available-for-sale, 12 months or longer, Fair Value	0	0
Available-for-sale, 12 months or longer, Unrealized losses	0	0
Available-for-sale, Total Fair Value	61,535,000	5,380,000
Available-for-sale, Total Unrealized Losses	(657,000)	(37,000)
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	562,699,000	57,609,000
Available-for-sale, Less than 12 months, Unrealized Losses	(11,019,000)	(160,000)
Available-for-sale, 12 months or longer, Fair Value	46,504,000	2,377,000
Available-for-sale, 12 months or longer, Unrealized losses	(1,691,000)	0
Available-for-sale, Total Fair Value	609,203,000	59,986,000
Available-for-sale, Total Unrealized Losses	(12,710,000)	(160,000)
Other Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	7,976,000	3,977,000
Available-for-sale, Less than 12 months, Unrealized Losses	(105,000)	(13,000)
Available-for-sale, 12 months or longer, Fair Value	0	0
Available-for-sale, 12 months or longer, Unrealized losses	0	0
Available-for-sale, Total Fair Value	7,976,000	3,977,000
Available-for-sale, Total Unrealized Losses	$ (105,000)	$ (13,000)

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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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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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