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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | $ 22,824 | $ 34,698
Available-for-sale, Less than 12 months, Unrealized Losses | (1,266) | (843)
Available-for-sale, 12 months or longer, Fair Value | 1,001,277 | 1,075,835
Available-for-sale, 12 months or longer, Unrealized losses | (193,568) | (192,616)
Available-for-sale, Total Fair Value | 1,024,101 | 1,110,533
Available-for-sale, Total Unrealized Losses | (194,834) | (193,459)
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 | 1,340 | 1,288
Available-for-sale, Less than 12 months, Unrealized Losses | 0 | (4)
Available-for-sale, 12 months or longer, Fair Value | 189,327 | 210,069
Available-for-sale, 12 months or longer, Unrealized losses | (21,158) | (26,215)
Available-for-sale, Total Fair Value | 190,667 | 211,357
Available-for-sale, Total Unrealized Losses | (21,158) | (26,219)
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 | 20,349 | 22,281
Available-for-sale, Less than 12 months, Unrealized Losses | (1,248) | (333)
Available-for-sale, 12 months or longer, Fair Value | 241,502 | 241,630
Available-for-sale, 12 months or longer, Unrealized losses | (55,193) | (49,038)
Available-for-sale, Total Fair Value | 261,851 | 263,911
Available-for-sale, Total Unrealized Losses | (56,441) | (49,371)
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 | 1,135 | 5,818
Available-for-sale, Less than 12 months, Unrealized Losses | (18) | (67)
Available-for-sale, 12 months or longer, Fair Value | 511,746 | 566,197
Available-for-sale, 12 months or longer, Unrealized losses | (114,552) | (113,007)
Available-for-sale, Total Fair Value | 512,881 | 572,015
Available-for-sale, Total Unrealized Losses | (114,570) | (113,074)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 0 | 5,311
Available-for-sale, Less than 12 months, Unrealized Losses | 0 | (439)
Available-for-sale, 12 months or longer, Fair Value | 58,702 | 57,939
Available-for-sale, 12 months or longer, Unrealized losses | (2,665) | (4,356)
Available-for-sale, Total Fair Value | 58,702 | 63,250
Available-for-sale, Total Unrealized Losses | $ (2,665) | $ (4,795)

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