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Loans and Loans Held for Sale - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unearned income $ 14,000 $ 16,000 $ 14,000   $ 16,000
Purchase accounting fair value adjustments 7,500 8,600      
Total loans 7,068,067 7,108,248 7,068,067   7,108,248
Loans held for investment, outstanding balance $ 7,183,168 7,225,860 $ 7,183,168   7,225,860
Threshold period of satisfactory performance for troubled debt restructuring to be restored to accruing status     6 months    
Restructured loans     $ 6,865 $ 1,897  
Number of troubled debt restructuring loans returned to accruing status | loan     0 0  
Number of commitments to lend additional funds on TDRs | loan 20   20    
Commitments to lend additional funds on TDRs $ 800   $ 800    
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       11  
Amount of defaulted TDRs that were restructured within the last twelve months prior to defaulting       $ 21,100  
Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance $ 5,676,683 $ 5,673,707 $ 5,676,683   $ 5,673,707
Financing receivable, before allowance for credit loss, reclassification during period     $ 90,200    
Percentage of commercial loans in total portfolio loans 79.00% 78.50% 79.00%   78.50%
Commercial | CARES Act, Paycheck Protection Program Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Restructured loans     $ 61,800    
Number of modified loans | loan     40   52
Modified loans     $ 61,800   $ 195,600
Business banking portfolio          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance $ 1,100,000 $ 1,200,000 1,100,000   1,200,000
Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 1,506,485 1,552,153 1,506,485   1,552,153
Financing receivable, before allowance for credit loss, reclassification during period     23,200    
CARES Act, Paycheck Protection Program Loans | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans 499,100   499,100    
Commercial real estate | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 2,780,327 2,791,947 2,780,327   2,791,947
Restructured loans     0 0  
Commercial real estate | Business banking portfolio          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 504,200 453,000 504,200   453,000
Commercial and industrial | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 1,699,588 1,559,552 1,699,588   1,559,552
Restructured loans     6,296 0  
Commercial and industrial | Business banking portfolio          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 232,100 394,900 232,100   394,900
Commercial construction | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 449,459 466,077 449,459   466,077
Restructured loans     0 1,806  
Commercial construction | Business banking portfolio          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 11,000 8,200 11,000   8,200
Business banking | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 1,069,078 1,160,067 1,069,078   1,160,067
Restructured loans     0 $ 0  
Business banking | Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 321,800 303,900 321,800   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   $ 3,700,000
Combined percentage of commercial real estate and commercial construction in total commercial loans 66.00% 65.60% 66.00%   65.60%
Combined percentage of commercial real estate and commercial construction in total portfolio loans 52.10% 51.50% 52.10%   51.50%
Out of market exposure of combined portfolio (percent) 5.70% 5.90% 5.70%   5.90%
Percentage of total loans out-of-state excluding contiguous states 3.00% 3.00% 3.00%   3.00%
Nonperforming TDRs          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, nonperforming assets, period increase (decrease)     $ 11,600    
Nonperforming TDRs | Commercial real estate | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Restructured loans     4,600    
Nonperforming TDRs | Commercial and industrial | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Restructured loans     11,100    
Amount charged down     $ 3,900