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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 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 | $ 66,643 | $ 507,751
Available-for-sale, Less than 12 months, Unrealized Losses | (3,253) | (70,248)
Available-for-sale, 12 months or longer, Fair Value | 1,039,657 | 677,083
Available-for-sale, 12 months or longer, Unrealized losses | (250,785) | (143,282)
Available-for-sale, Total Fair Value | 1,106,300 | 1,184,834
Available-for-sale, Total Unrealized Losses | (254,038) | (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 | 3,204 | 57,007
Available-for-sale, Less than 12 months, Unrealized Losses | (38) | (3,493)
Available-for-sale, 12 months or longer, Fair Value | 208,428 | 163,520
Available-for-sale, 12 months or longer, Unrealized losses | (33,681) | (28,914)
Available-for-sale, Total Fair Value | 211,632 | 220,527
Available-for-sale, Total Unrealized Losses | (33,719) | (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 | 41,664 | 220,102
Available-for-sale, Less than 12 months, Unrealized Losses | (2,467) | (43,221)
Available-for-sale, 12 months or longer, Fair Value | 219,250 | 45,419
Available-for-sale, 12 months or longer, Unrealized losses | (72,090) | (16,624)
Available-for-sale, Total Fair Value | 260,914 | 265,521
Available-for-sale, Total Unrealized Losses | (74,557) | (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 | 16,495 | 165,966
Available-for-sale, Less than 12 months, Unrealized Losses | (278) | (19,859)
Available-for-sale, 12 months or longer, Fair Value | 555,338 | 461,446
Available-for-sale, 12 months or longer, Unrealized losses | (139,349) | (96,900)
Available-for-sale, Total Fair Value | 571,833 | 627,412
Available-for-sale, Total Unrealized Losses | (139,627) | (116,759)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 5,280 | 64,676
Available-for-sale, Less than 12 months, Unrealized Losses | (470) | (3,675)
Available-for-sale, 12 months or longer, Fair Value | 56,641 | 6,698
Available-for-sale, 12 months or longer, Unrealized losses | (5,665) | (844)
Available-for-sale, Total Fair Value | 61,921 | 71,374
Available-for-sale, Total Unrealized Losses | $ (6,135) | $ (4,519)

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