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Loans and Loans Held for Sale - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
SecurityLoan
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
SecurityLoan
Sep. 30, 2021
USD ($)
SecurityLoan
Sep. 30, 2020
USD ($)
SecurityLoan
Dec. 31, 2020
USD ($)
SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unearned income $ 14,500     $ 14,500   $ 16,000
Purchase accounting fair value adjustments 6,400     6,400   8,600
Total loans 6,861,739     6,861,739   7,108,248
Loans held for investment, outstanding balance $ 6,970,087     $ 6,970,087   7,225,860
Threshold period of satisfactory performance for troubled debt restructuring to be restored to accruing status       6 months    
Number of troubled debt restructuring loans returned to accruing status | SecurityLoan 1   2 6 3  
Financing receivable, troubled debt restructuring, returned to accruing status $ 100   $ 100 $ 500 $ 22,700  
Number of commitments to lend additional funds on TDRs | SecurityLoan 12     12    
Commitments to lend additional funds on TDRs $ 300     $ 300    
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 | SecurityLoan 0   0 0 6  
Amount of defaulted TDRs that were restructured within the last twelve months prior to defaulting         $ 18,100  
Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance $ 5,423,964     $ 5,423,964   $ 5,673,707
Financing receivable, before allowance for credit loss, reclassification during period   $ 90,200        
Percentage of commercial loans in total portfolio loans 77.80%     77.80%   78.50%
Commercial | CARES Act, Paycheck Protection Program Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans $ 181,000     $ 181,000   $ 465,000
Number of modified loans | SecurityLoan       42   52
Modified loans       $ 58,900   $ 195,600
Business banking portfolio            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 1,100,000     1,100,000   1,200,000
Business banking portfolio | CARES Act, Paycheck Protection Program Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Decrease in finance receivables (100,500)     (100,500)    
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 1,546,123     1,546,123   1,552,153
Financing receivable, before allowance for credit loss, reclassification during period   $ 23,200        
Commercial real estate | Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 2,702,780     2,702,780   2,791,947
Commercial real estate | Business banking portfolio            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 523,100     523,100   453,000
Commercial and industrial | Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 1,478,198     1,478,198   1,559,552
Commercial and industrial | Business banking portfolio            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 220,600     220,600   394,900
Commercial and industrial | Business banking portfolio | CARES Act, Paycheck Protection Program Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 78,000     78,000   178,400
Commercial construction | Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 485,924     485,924   466,077
Commercial construction | Business banking portfolio            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 13,400     13,400   8,200
Consumer real estate | Business banking portfolio            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 343,000     343,000    
Consumer real estate | Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 1,105,478     1,105,478   1,167,332
Business banking | Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance 1,100,125     1,100,125   1,160,067
Business banking | Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance           303,900
CRE and commercial construction | Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans held for investment, outstanding balance $ 3,700,000     $ 3,700,000   $ 3,700,000
Combined percentage of commercial real estate and commercial construction in total commercial loans 68.70%     68.70%   65.60%
Combined percentage of commercial real estate and commercial construction in total portfolio loans 53.40%     53.40%   51.50%
Out of market exposure of combined portfolio 5.00%     5.00%   5.90%
Percentage of total loans out-of-state excluding contiguous states 2.70%     2.70%   3.00%