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Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS and HTM $ 2,102,137 $ 2,023,736
Unrealized Losses, AFS and HTM 275,784 30,297
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS and HTM 846,458 487,570
Unrealized Losses, AFS and HTM 141,585 18,031
Total    
Fair Value, AFS and HTM 2,948,595 2,511,306
Unrealized Losses, AFS and HTM 417,369 48,328
U.S. Treasuries    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS 172,195  
Unrealized Losses, AFS 2,041  
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS 0  
Unrealized Losses, AFS 0  
Total    
Fair Value, AFS 172,195  
Unrealized Losses, AFS 2,041  
Government-sponsored enterprise securities    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS 18,850 21,436
Unrealized Losses, AFS 3,109 522
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS 42,067 47,743
Unrealized Losses, AFS 7,928 2,250
Total    
Fair Value, AFS 60,917 69,179
Unrealized Losses, AFS 11,037 2,772
Mortgage-backed securities    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS and HTM 1,505,339 1,773,022
Unrealized Losses, AFS and HTM 189,853 25,977
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS and HTM 761,606 404,484
Unrealized Losses, AFS and HTM 120,612 13,857
Total    
Fair Value, AFS and HTM 2,266,945 2,177,506
Unrealized Losses, AFS and HTM 310,465 39,834
Corporate bonds    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS 13,593 999
Unrealized Losses, AFS 407 1
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS 907 945
Unrealized Losses, AFS 93 55
Total    
Fair Value, AFS 14,500 1,944
Unrealized Losses, AFS 500 56
State and local governments    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, HTM 392,160 228,279
Unrealized Losses, HTM 80,374 3,797
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, HTM 41,878 34,398
Unrealized Losses, HTM 12,952 1,869
Total    
Fair Value, HTM 434,038 262,677
Unrealized Losses, HTM $ 93,326 $ 5,666