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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 19,830 | $ 22,824
Available-for-sale, Less than 12 months, Unrealized Losses | (1,350) | (1,266)
Available-for-sale, 12 months or longer, Fair Value | 977,677 | 1,001,277
Available-for-sale, 12 months or longer, Unrealized losses | (184,984) | (193,568)
Available-for-sale, Total Fair Value | 997,507 | 1,024,101
Available-for-sale, Total Unrealized Losses | (186,334) | (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 | 1,091 | 1,340
Available-for-sale, Less than 12 months, Unrealized Losses | (2) | 0
Available-for-sale, 12 months or longer, Fair Value | 183,392 | 189,327
Available-for-sale, 12 months or longer, Unrealized losses | (18,144) | (21,158)
Available-for-sale, Total Fair Value | 184,483 | 190,667
Available-for-sale, Total Unrealized Losses | (18,146) | (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 | 17,581 | 20,349
Available-for-sale, Less than 12 months, Unrealized Losses | (1,343) | (1,248)
Available-for-sale, 12 months or longer, Fair Value | 237,147 | 241,502
Available-for-sale, 12 months or longer, Unrealized losses | (60,804) | (55,193)
Available-for-sale, Total Fair Value | 254,728 | 261,851
Available-for-sale, Total Unrealized Losses | (62,147) | (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 | 1,158 | 1,135
Available-for-sale, Less than 12 months, Unrealized Losses | (5) | (18)
Available-for-sale, 12 months or longer, Fair Value | 503,901 | 511,746
Available-for-sale, 12 months or longer, Unrealized losses | (103,886) | (114,552)
Available-for-sale, Total Fair Value | 505,059 | 512,881
Available-for-sale, Total Unrealized Losses | (103,891) | (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 | 53,237 | 58,702
Available-for-sale, 12 months or longer, Unrealized losses | (2,150) | (2,665)
Available-for-sale, Total Fair Value | 53,237 | 58,702
Available-for-sale, Total Unrealized Losses | $ (2,150) | $ (2,665)

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