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Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair value, AFS and HTM $ 5,804 $ 1,117
Unrealized losses, AFS and HTM 27 5
Securities in an Unrealized Loss Position for More than 12 Months    
Fair value, AFS and HTM 2,514,959 2,628,150
Unrealized losses, AFS and HTM 507,860 484,839
Total    
Fair value, AFS and HTM 2,520,763 2,629,267
Unrealized losses, AFS and HTM 507,887 484,844
U.S. Treasuries    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair value, AFS 0 0
Unrealized losses, AFS 0 0
Securities in an Unrealized Loss Position for More than 12 Months    
Fair value, AFS 123,770 172,570
Unrealized losses, AFS 1,106 2,215
Total    
Fair Value, AFS 123,770 172,570
Unrealized losses, AFS 1,106 2,215
Government-sponsored enterprise securities    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair value, AFS 0 0
Unrealized losses, AFS 0 0
Securities in an Unrealized Loss Position for More than 12 Months    
Fair value, AFS 59,959 60,266
Unrealized losses, AFS 12,006 11,698
Total    
Fair Value, AFS 59,959 60,266
Unrealized losses, AFS 12,006 11,698
Mortgage-backed securities    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair value, AFS and HTM 448 1,117
Unrealized losses, AFS and HTM 1 5
Securities in an Unrealized Loss Position for More than 12 Months    
Fair value, AFS and HTM 1,895,026 1,945,830
Unrealized losses, AFS and HTM 405,613 386,553
Total    
Fair value, AFS and HTM 1,895,474 1,946,947
Unrealized losses, AFS and HTM 405,614 386,558
Corporate bonds    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair value, AFS 0 0
Unrealized losses, AFS 0 0
Securities in an Unrealized Loss Position for More than 12 Months    
Fair value, AFS 16,055 17,008
Unrealized losses, AFS 871 917
Total    
Fair Value, AFS 16,055 17,008
Unrealized losses, AFS 871 917
State and local governments    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair value, HTM 5,356 0
Unrealized losses, HTM 26 0
Securities in an Unrealized Loss Position for More than 12 Months    
Fair value, HTM 420,149 432,476
Unrealized losses, HTM 88,264 83,456
Total    
Fair value, HTM 425,505 432,476
Unrealized losses, HTM $ 88,290 $ 83,456