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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
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)