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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | $ 5,967 | $ 22,824
Available-for-sale, Less than 12 months, Unrealized Losses | (33) | (1,266)
Available-for-sale, 12 months or longer, Fair Value | 914,868 | 1,001,277
Available-for-sale, 12 months or longer, Unrealized losses | (153,515) | (193,568)
Available-for-sale, Total Fair Value | 920,835 | 1,024,101
Available-for-sale, Total Unrealized Losses | (153,548) | (194,834)
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 | 790 | 1,340
Available-for-sale, Less than 12 months, Unrealized Losses | 0 | 0
Available-for-sale, 12 months or longer, Fair Value | 151,518 | 189,327
Available-for-sale, 12 months or longer, Unrealized losses | (11,147) | (21,158)
Available-for-sale, Total Fair Value | 152,308 | 190,667
Available-for-sale, Total Unrealized Losses | (11,147) | (21,158)
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 | 2,361 | 20,349
Available-for-sale, Less than 12 months, Unrealized Losses | (15) | (1,248)
Available-for-sale, 12 months or longer, Fair Value | 243,565 | 241,502
Available-for-sale, 12 months or longer, Unrealized losses | (53,805) | (55,193)
Available-for-sale, Total Fair Value | 245,926 | 261,851
Available-for-sale, Total Unrealized Losses | (53,820) | (56,441)
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 | 2,816 | 1,135
Available-for-sale, Less than 12 months, Unrealized Losses | (18) | (18)
Available-for-sale, 12 months or longer, Fair Value | 490,374 | 511,746
Available-for-sale, 12 months or longer, Unrealized losses | (87,381) | (114,552)
Available-for-sale, Total Fair Value | 493,190 | 512,881
Available-for-sale, Total Unrealized Losses | (87,399) | (114,570)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 0 | 0
Available-for-sale, Less than 12 months, Unrealized Losses | 0 | 0
Available-for-sale, 12 months or longer, Fair Value | 29,411 | 58,702
Available-for-sale, 12 months or longer, Unrealized losses | (1,182) | (2,665)
Available-for-sale, Total Fair Value | 29,411 | 58,702
Available-for-sale, Total Unrealized Losses | $ (1,182) | $ (2,665)

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