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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021
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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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