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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 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 | $ 56,640 | $ 507,751
Available-for-sale, Less than 12 months, Unrealized Losses | (1,605) | (70,248)
Available-for-sale, 12 months or longer, Fair Value | 1,092,621 | 677,083
Available-for-sale, 12 months or longer, Unrealized losses | (211,927) | (143,282)
Available-for-sale, Total Fair Value | 1,149,261 | 1,184,834
Available-for-sale, Total Unrealized Losses | (213,532) | (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 | 1,553 | 57,007
Available-for-sale, Less than 12 months, Unrealized Losses | (18) | (3,493)
Available-for-sale, 12 months or longer, Fair Value | 213,600 | 163,520
Available-for-sale, 12 months or longer, Unrealized losses | (31,540) | (28,914)
Available-for-sale, Total Fair Value | 215,153 | 220,527
Available-for-sale, Total Unrealized Losses | (31,558) | (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 | 42,383 | 220,102
Available-for-sale, Less than 12 months, Unrealized Losses | (591) | (43,221)
Available-for-sale, 12 months or longer, Fair Value | 230,437 | 45,419
Available-for-sale, 12 months or longer, Unrealized losses | (55,831) | (16,624)
Available-for-sale, Total Fair Value | 272,820 | 265,521
Available-for-sale, Total Unrealized Losses | (56,422) | (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 | 2,862 | 165,966
Available-for-sale, Less than 12 months, Unrealized Losses | (95) | (19,859)
Available-for-sale, 12 months or longer, Fair Value | 590,760 | 461,446
Available-for-sale, 12 months or longer, Unrealized losses | (119,552) | (96,900)
Available-for-sale, Total Fair Value | 593,622 | 627,412
Available-for-sale, Total Unrealized Losses | (119,647) | (116,759)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 9,842 | 64,676
Available-for-sale, Less than 12 months, Unrealized Losses | (901) | (3,675)
Available-for-sale, 12 months or longer, Fair Value | 57,824 | 6,698
Available-for-sale, 12 months or longer, Unrealized losses | (5,004) | (844)
Available-for-sale, Total Fair Value | 67,666 | 71,374
Available-for-sale, Total Unrealized Losses | $ (5,905) | $ (4,519)

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