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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 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 | $ 22,379 | $ 22,824
Available-for-sale, Less than 12 months, Unrealized Losses | (480) | (1,266)
Available-for-sale, 12 months or longer, Fair Value | 960,139 | 1,001,277
Available-for-sale, 12 months or longer, Unrealized losses | (179,861) | (193,568)
Available-for-sale, Total Fair Value | 982,518 | 1,024,101
Available-for-sale, Total Unrealized Losses | (180,341) | (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 | 1,583 | 1,340
Available-for-sale, Less than 12 months, Unrealized Losses | (2) | 0
Available-for-sale, 12 months or longer, Fair Value | 182,033 | 189,327
Available-for-sale, 12 months or longer, Unrealized losses | (15,681) | (21,158)
Available-for-sale, Total Fair Value | 183,616 | 190,667
Available-for-sale, Total Unrealized Losses | (15,683) | (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 | 8,584 | 20,349
Available-for-sale, Less than 12 months, Unrealized Losses | (323) | (1,248)
Available-for-sale, 12 months or longer, Fair Value | 242,507 | 241,502
Available-for-sale, 12 months or longer, Unrealized losses | (64,164) | (55,193)
Available-for-sale, Total Fair Value | 251,091 | 261,851
Available-for-sale, Total Unrealized Losses | (64,487) | (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 | 12,212 | 1,135
Available-for-sale, Less than 12 months, Unrealized Losses | (155) | (18)
Available-for-sale, 12 months or longer, Fair Value | 495,160 | 511,746
Available-for-sale, 12 months or longer, Unrealized losses | (98,051) | (114,552)
Available-for-sale, Total Fair Value | 507,372 | 512,881
Available-for-sale, Total Unrealized Losses | (98,206) | (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 | 40,439 | 58,702
Available-for-sale, 12 months or longer, Unrealized losses | (1,965) | (2,665)
Available-for-sale, Total Fair Value | 40,439 | 58,702
Available-for-sale, Total Unrealized Losses | $ (1,965) | $ (2,665)

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