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Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS and HTM $ 2,271,122 $ 2,023,736
Unrealized Losses, AFS and HTM 182,246 30,297
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS and HTM 791,655 487,570
Unrealized Losses, AFS and HTM 86,135 18,031
Total    
Fair Value, AFS and HTM 3,062,777 2,511,306
Unrealized Losses, AFS and HTM 268,381 48,328
US Treasuries    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS 149,391  
Unrealized Losses, AFS 143  
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS 0  
Unrealized Losses, AFS 0  
Total    
Fair Value, AFS 149,391  
Unrealized Losses, AFS 143  
Government-sponsored enterprise securities    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS 19,855 21,436
Unrealized Losses, AFS 2,104 522
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS 44,313 47,743
Unrealized Losses, AFS 5,681 2,250
Total    
Fair Value, AFS 64,168 69,179
Unrealized Losses, AFS 7,785 2,772
Mortgage-backed securities    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS and HTM 1,656,529 1,773,022
Unrealized Losses, AFS and HTM 133,422 25,977
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS and HTM 705,932 404,484
Unrealized Losses, AFS and HTM 73,220 13,857
Total    
Fair Value, AFS and HTM 2,362,461 2,177,506
Unrealized Losses, AFS and HTM 206,642 39,834
Corporate bonds    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, AFS 13,914 999
Unrealized Losses, AFS 86 1
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, AFS 928 945
Unrealized Losses, AFS 72 55
Total    
Fair Value, AFS 14,842 1,944
Unrealized Losses, AFS 158 56
State and local governments    
Securities in an Unrealized Loss Position for Less than 12 Months    
Fair Value, HTM 431,433 228,279
Unrealized Losses, HTM 46,491 3,797
Securities in an Unrealized Loss Position for More than 12 Months    
Fair Value, HTM 40,482 34,398
Unrealized Losses, HTM 7,162 1,869
Total    
Fair Value, HTM 471,915 262,677
Unrealized Losses, HTM $ 53,653 $ 5,666