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Loans and Loans Held for Sale - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, net of unearned income $ 4,600   $ 4,600   $ 5,300
Threshold period of satisfactory performance for troubled debt restructuring to be restored to accruing status     6 months    
Post-Modification Outstanding Recorded Investment [1] $ 25,800 $ 633 $ 36,712 $ 11,699  
Number of troubled debt restructuring loans returned to accruing status | loan 3 0 5 0  
Amount of trouble debt restructuring loans returned to accruing status $ 200   $ 200    
Number of commitments to lend additional funds on TDRs | loan 13   13    
Commitments to lend additional funds on TDRs $ 10,500   $ 10,500    
Minimum period of loan payment defaults following restructure for TDRs to be in default     90 days    
Number of defaulted TDRs that were restructured within the last twelve months prior to defaulting | loan 0 0 0 0  
Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of commercial loans in total portfolio loans 78.50%   78.50%   78.60%
Commercial loans $ 4,863,864   $ 4,863,864   $ 4,672,445
Commercial real estate and commercial construction | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loans $ 3,200,000   $ 3,200,000   $ 3,200,000
Combined percentage of commercial real estate and commercial construction in total commercial loans 66.60%   66.60%   68.00%
Combined percentage of commercial real estate and commercial construction in total portfolio loans 52.20%   52.20%   53.50%
Concentration risk percentage of commercial real estate and commercial construction     0.00%   0.00%
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of) 13.30%   13.30%   13.70%
Out of market exposure of combined portfolio (percent) 6.40%   6.40%   5.40%
Percentage of total loans out-of-state excluding contiguous states 3.40%   3.40%   2.90%
Commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Post-Modification Outstanding Recorded Investment [1] $ 23,784 $ 250 $ 29,747 $ 250  
Commercial real estate | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loans 2,922,197   2,922,197   $ 2,921,832
Performing TDRs          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Post-Modification Outstanding Recorded Investment     38,434   16,786
Performing TDRs | Commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Post-Modification Outstanding Recorded Investment $ 19,900   $ 21,448   $ 2,054
[1] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.