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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | $ 74,007 | $ 507,751
Available-for-sale, Less than 12 months, Unrealized Losses | (2,349) | (70,248)
Available-for-sale, 12 months or longer, Fair Value | 1,099,203 | 677,083
Available-for-sale, 12 months or longer, Unrealized losses | (192,066) | (143,282)
Available-for-sale, Total Fair Value | 1,173,210 | 1,184,834
Available-for-sale, Total Unrealized Losses | (194,415) | (213,530)
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 | 1,757 | 57,007
Available-for-sale, Less than 12 months, Unrealized Losses | (19) | (3,493)
Available-for-sale, 12 months or longer, Fair Value | 220,714 | 163,520
Available-for-sale, 12 months or longer, Unrealized losses | (29,669) | (28,914)
Available-for-sale, Total Fair Value | 222,471 | 220,527
Available-for-sale, Total Unrealized Losses | (29,688) | (32,407)
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 | 45,880 | 220,102
Available-for-sale, Less than 12 months, Unrealized Losses | (1,204) | (43,221)
Available-for-sale, 12 months or longer, Fair Value | 212,715 | 45,419
Available-for-sale, 12 months or longer, Unrealized losses | (53,765) | (16,624)
Available-for-sale, Total Fair Value | 258,595 | 265,521
Available-for-sale, Total Unrealized Losses | (54,969) | (59,845)
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 | 12,887 | 165,966
Available-for-sale, Less than 12 months, Unrealized Losses | (589) | (19,859)
Available-for-sale, 12 months or longer, Fair Value | 610,896 | 461,446
Available-for-sale, 12 months or longer, Unrealized losses | (105,178) | (96,900)
Available-for-sale, Total Fair Value | 623,783 | 627,412
Available-for-sale, Total Unrealized Losses | (105,767) | (116,759)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 13,483 | 64,676
Available-for-sale, Less than 12 months, Unrealized Losses | (537) | (3,675)
Available-for-sale, 12 months or longer, Fair Value | 54,878 | 6,698
Available-for-sale, 12 months or longer, Unrealized losses | (3,454) | (844)
Available-for-sale, Total Fair Value | 68,361 | 71,374
Available-for-sale, Total Unrealized Losses | $ (3,991) | $ (4,519)

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