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Loans and Allowance for Credit Losses - Activity in the Allowance for Loan Losses, by Portfolio Segment, for the Current Year (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period     $ 238,050  
Provision for credit loss expense $ (12,951) $ 21,915 (11,506) $ 45,049
Balance, end of period 227,239   227,239  
Loans, Excluding Acquired Loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period 235,116 243,195 238,050 68,244
Provision for credit loss expense (10,011) 26,678 (10,011) 52,875
Charge-offs (2,205) (39,156) (6,456) (42,895)
Recoveries 4,339 926 5,656 2,042
Net charge-offs 2,134 (38,230) (800) (40,853)
Balance, end of period 227,239 231,643 227,239 231,643
Loans, Excluding Acquired Loans | Other Consumer and Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period 2,485 18,029 5,617 2,169
Provision for credit loss expense 1,117 (5,685) (1,617) (987)
Charge-offs (411) (592) (1,113) (1,971)
Recoveries 425 303 729 746
Net charge-offs 14 (289) (384) (1,225)
Balance, end of period 3,616 12,055 3,616 12,055
Loans, Excluding Acquired Loans | Commercial        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period 34,633 76,327 42,093 22,863
Provision for credit loss expense (6,678) 18,400 (13,599) 49,307
Charge-offs (309) (35,687) (1,168) (36,210)
Recoveries 2,147 98 2,467 445
Net charge-offs 1,838 (35,589) 1,299 (35,765)
Balance, end of period 29,793 59,138 29,793 59,138
Loans, Excluding Acquired Loans | Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period 195,826 141,022 182,868 39,161
Provision for credit loss expense (8,522) 10,020 5,720 (2,138)
Charge-offs (439) (1,824) (2,126) (2,220)
Recoveries 1,523 253 1,926 354
Net charge-offs 1,084 (1,571) (200) (1,866)
Balance, end of period 188,388 149,471 188,388 149,471
Loans, Excluding Acquired Loans | Consumer | Credit cards        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period 2,172 7,817 7,472 4,051
Provision for credit loss expense 4,072 3,943 (515) 6,693
Charge-offs (1,046) (1,053) (2,049) (2,494)
Recoveries 244 272 534 497
Net charge-offs (802) (781) (1,515) (1,997)
Balance, end of period $ 5,442 $ 10,979 $ 5,442 10,979
Cumulative Effect, Period of Adoption, Adjustment | Loans, Excluding Acquired Loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period       151,377
Cumulative Effect, Period of Adoption, Adjustment | Loans, Excluding Acquired Loans | Other Consumer and Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period       12,098
Cumulative Effect, Period of Adoption, Adjustment | Loans, Excluding Acquired Loans | Commercial        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period       22,733
Cumulative Effect, Period of Adoption, Adjustment | Loans, Excluding Acquired Loans | Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period       114,314
Cumulative Effect, Period of Adoption, Adjustment | Loans, Excluding Acquired Loans | Consumer | Credit cards        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period       $ 2,232