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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 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 | $ 507,751 | $ 680,526
Available-for-sale, Less than 12 months, Unrealized Losses | (70,248) | (13,708)
Available-for-sale, 12 months or longer, Fair Value | 677,083 | 186,350
Available-for-sale, 12 months or longer, Unrealized losses | (143,282) | (4,627)
Available-for-sale, Total Fair Value | 1,184,834 | 866,876
Available-for-sale, Total Unrealized Losses | (213,530) | (18,335)
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 | 57,007 | 48,316
Available-for-sale, Less than 12 months, Unrealized Losses | (3,493) | (1,927)
Available-for-sale, 12 months or longer, Fair Value | 163,520 | 139,846
Available-for-sale, 12 months or longer, Unrealized losses | (28,914) | (2,936)
Available-for-sale, Total Fair Value | 220,527 | 188,162
Available-for-sale, Total Unrealized Losses | (32,407) | (4,863)
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 | 220,102 | 61,535
Available-for-sale, Less than 12 months, Unrealized Losses | (43,221) | (657)
Available-for-sale, 12 months or longer, Fair Value | 45,419 | 0
Available-for-sale, 12 months or longer, Unrealized losses | (16,624) | 0
Available-for-sale, Total Fair Value | 265,521 | 61,535
Available-for-sale, Total Unrealized Losses | (59,845) | (657)
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 | 165,966 | 562,699
Available-for-sale, Less than 12 months, Unrealized Losses | (19,859) | (11,019)
Available-for-sale, 12 months or longer, Fair Value | 461,446 | 46,504
Available-for-sale, 12 months or longer, Unrealized losses | (96,900) | (1,691)
Available-for-sale, Total Fair Value | 627,412 | 609,203
Available-for-sale, Total Unrealized Losses | (116,759) | (12,710)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 64,676 | 7,976
Available-for-sale, Less than 12 months, Unrealized Losses | (3,675) | (105)
Available-for-sale, 12 months or longer, Fair Value | 6,698 | 0
Available-for-sale, 12 months or longer, Unrealized losses | (844) | 0
Available-for-sale, Total Fair Value | 71,374 | 7,976
Available-for-sale, Total Unrealized Losses | $ (4,519) | $ (105)

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