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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Available-for-sale, Less than 12 months, Fair Value $ 32,383 $ 34,698
Available-for-sale, Less than 12 months, Unrealized Losses (1,517) (843)
Available-for-sale, 12 months or longer, Fair Value 1,036,465 1,075,835
Available-for-sale, 12 months or longer, Unrealized losses (199,931) (192,616)
Available-for-sale, Total Fair Value 1,068,848 1,110,533
Available-for-sale, Total Unrealized Losses (201,448) (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 3,293 1,288
Available-for-sale, Less than 12 months, Unrealized Losses (1) (4)
Available-for-sale, 12 months or longer, Fair Value 196,288 210,069
Available-for-sale, 12 months or longer, Unrealized losses (25,248) (26,215)
Available-for-sale, Total Fair Value 199,581 211,357
Available-for-sale, Total Unrealized Losses (25,249) (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 23,541 22,281
Available-for-sale, Less than 12 months, Unrealized Losses (1,370) (333)
Available-for-sale, 12 months or longer, Fair Value 247,125 241,630
Available-for-sale, 12 months or longer, Unrealized losses (56,082) (49,038)
Available-for-sale, Total Fair Value 270,666 263,911
Available-for-sale, Total Unrealized Losses (57,452) (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 5,549 5,818
Available-for-sale, Less than 12 months, Unrealized Losses (146) (67)
Available-for-sale, 12 months or longer, Fair Value 535,856 566,197
Available-for-sale, 12 months or longer, Unrealized losses (114,474) (113,007)
Available-for-sale, Total Fair Value 541,405 572,015
Available-for-sale, Total Unrealized Losses (114,620) (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 57,196 57,939
Available-for-sale, 12 months or longer, Unrealized losses (4,127) (4,356)
Available-for-sale, Total Fair Value 57,196 63,250
Available-for-sale, Total Unrealized Losses $ (4,127) $ (4,795)