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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) | Mar. 31, 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 | $ 982,049,000 | $ 680,526,000
Available-for-sale, Less than 12 months, Unrealized Losses | (72,996,000) | (13,708,000)
Available-for-sale, 12 months or longer, Fair Value | 319,139,000 | 186,350,000
Available-for-sale, 12 months or longer, Unrealized losses | (34,538,000) | (4,627,000)
Available-for-sale, Total Fair Value | 1,301,188,000 | 866,876,000
Available-for-sale, Total Unrealized Losses | (107,534,000) | (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 | 124,219,000 | 48,316,000
Available-for-sale, Less than 12 months, Unrealized Losses | (5,410,000) | (1,927,000)
Available-for-sale, 12 months or longer, Fair Value | 116,577,000 | 139,846,000
Available-for-sale, 12 months or longer, Unrealized losses | (11,117,000) | (2,936,000)
Available-for-sale, Total Fair Value | 240,796,000 | 188,162,000
Available-for-sale, Total Unrealized Losses | (16,527,000) | (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 | 231,248,000 | 61,535,000
Available-for-sale, Less than 12 months, Unrealized Losses | (29,282,000) | (657,000)
Available-for-sale, 12 months or longer, Fair Value | 6,399,000 | 0
Available-for-sale, 12 months or longer, Unrealized losses | (1,241,000) | 0
Available-for-sale, Total Fair Value | 237,647,000 | 61,535,000
Available-for-sale, Total Unrealized Losses | (30,523,000) | (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 | 546,117,000 | 562,699,000
Available-for-sale, Less than 12 months, Unrealized Losses | (37,044,000) | (11,019,000)
Available-for-sale, 12 months or longer, Fair Value | 193,648,000 | 46,504,000
Available-for-sale, 12 months or longer, Unrealized losses | (22,122,000) | (1,691,000)
Available-for-sale, Total Fair Value | 739,765,000 | 609,203,000
Available-for-sale, Total Unrealized Losses | (59,166,000) | (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 | 80,465,000 | 7,976,000
Available-for-sale, Less than 12 months, Unrealized Losses | (1,260,000) | (105,000)
Available-for-sale, 12 months or longer, Fair Value | 2,515,000 | 0
Available-for-sale, 12 months or longer, Unrealized losses | (58,000) | 0
Available-for-sale, Total Fair Value | 82,980,000 | 7,976,000
Available-for-sale, Total Unrealized Losses | $ (1,318,000) | $ (105,000)

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