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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 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 | $ 34,698 | $ 507,751
Available-for-sale, Less than 12 months, Unrealized Losses | (843) | (70,248)
Available-for-sale, 12 months or longer, Fair Value | 1,075,835 | 677,083
Available-for-sale, 12 months or longer, Unrealized losses | (192,616) | (143,282)
Available-for-sale, Total Fair Value | 1,110,533 | 1,184,834
Available-for-sale, Total Unrealized Losses | (193,459) | (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 | 1,288 | 57,007
Available-for-sale, Less than 12 months, Unrealized Losses | (4) | (3,493)
Available-for-sale, 12 months or longer, Fair Value | 210,069 | 163,520
Available-for-sale, 12 months or longer, Unrealized losses | (26,215) | (28,914)
Available-for-sale, Total Fair Value | 211,357 | 220,527
Available-for-sale, Total Unrealized Losses | (26,219) | (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 | 22,281 | 220,102
Available-for-sale, Less than 12 months, Unrealized Losses | (333) | (43,221)
Available-for-sale, 12 months or longer, Fair Value | 241,630 | 45,419
Available-for-sale, 12 months or longer, Unrealized losses | (49,038) | (16,624)
Available-for-sale, Total Fair Value | 263,911 | 265,521
Available-for-sale, Total Unrealized Losses | (49,371) | (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 | 5,818 | 165,966
Available-for-sale, Less than 12 months, Unrealized Losses | (67) | (19,859)
Available-for-sale, 12 months or longer, Fair Value | 566,197 | 461,446
Available-for-sale, 12 months or longer, Unrealized losses | (113,007) | (96,900)
Available-for-sale, Total Fair Value | 572,015 | 627,412
Available-for-sale, Total Unrealized Losses | (113,074) | (116,759)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 5,311 | 64,676
Available-for-sale, Less than 12 months, Unrealized Losses | (439) | (3,675)
Available-for-sale, 12 months or longer, Fair Value | 57,939 | 6,698
Available-for-sale, 12 months or longer, Unrealized losses | (4,356) | (844)
Available-for-sale, Total Fair Value | 63,250 | 71,374
Available-for-sale, Total Unrealized Losses | $ (4,795) | $ (4,519)

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