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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Available-for-sale, Less than 12 months, Fair Value $ 34,698 $ 507,751
Available-for-sale, Less than 12 months, Unrealized Losses (843) (70,248)
Available-for-sale, 12 months or longer, Fair Value 1,075,835 677,083
Available-for-sale, 12 months or longer, Unrealized losses (192,616) (143,282)
Available-for-sale, Total Fair Value 1,110,533 1,184,834
Available-for-sale, Total Unrealized Losses (193,459) (213,530)
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 1,288 57,007
Available-for-sale, Less than 12 months, Unrealized Losses (4) (3,493)
Available-for-sale, 12 months or longer, Fair Value 210,069 163,520
Available-for-sale, 12 months or longer, Unrealized losses (26,215) (28,914)
Available-for-sale, Total Fair Value 211,357 220,527
Available-for-sale, Total Unrealized Losses (26,219) (32,407)
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 22,281 220,102
Available-for-sale, Less than 12 months, Unrealized Losses (333) (43,221)
Available-for-sale, 12 months or longer, Fair Value 241,630 45,419
Available-for-sale, 12 months or longer, Unrealized losses (49,038) (16,624)
Available-for-sale, Total Fair Value 263,911 265,521
Available-for-sale, Total Unrealized Losses (49,371) (59,845)
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 5,818 165,966
Available-for-sale, Less than 12 months, Unrealized Losses (67) (19,859)
Available-for-sale, 12 months or longer, Fair Value 566,197 461,446
Available-for-sale, 12 months or longer, Unrealized losses (113,007) (96,900)
Available-for-sale, Total Fair Value 572,015 627,412
Available-for-sale, Total Unrealized Losses (113,074) (116,759)
Other Securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Available-for-sale, Less than 12 months, Fair Value 5,311 64,676
Available-for-sale, Less than 12 months, Unrealized Losses (439) (3,675)
Available-for-sale, 12 months or longer, Fair Value 57,939 6,698
Available-for-sale, 12 months or longer, Unrealized losses (4,356) (844)
Available-for-sale, Total Fair Value 63,250 71,374
Available-for-sale, Total Unrealized Losses $ (4,795) $ (4,519)