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Loans and Loans Held for Sale - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
SecurityLoan
loan
Sep. 30, 2021
USD ($)
SecurityLoan
loan
Sep. 30, 2022
USD ($)
loan
SecurityLoan
Sep. 30, 2021
USD ($)
loan
SecurityLoan
Dec. 31, 2021
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unearned income $ 7,900   $ 7,900   $ 14,100
Purchase accounting fair value adjustments 5,000   5,000   6,700
Total loans 6,997,222   6,997,222   6,901,414
Loans held for investment, outstanding balance $ 7,096,916   $ 7,096,916   6,999,990
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 2 1 2 6  
Financing receivable troubled debt restructuring returned to accruing status $ 200 $ 100 $ 200 $ 500  
Number of commitments to lend additional funds on TDRs | SecurityLoan 16 12 16 12  
Commitments to lend additional funds on TDRs $ 400 $ 300 $ 400 $ 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 | loan 1 0 2 0  
Amount of defaulted TDRs that were restructured within the last twelve months prior to defaulting $ 100   $ 200    
Commercial Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance $ 5,239,648   $ 5,239,648   $ 5,406,584
Percentage of commercial loans in total portfolio loans 73.80%   73.80%   77.20%
Commercial Loans | CARES Act, Paycheck Protection Program Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans $ 4,700   $ 4,700   $ 88,300
Business banking portfolio          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 1,200,000   1,200,000   1,100,000
Consumer Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 1,857,268   1,857,268   1,593,406
Commercial real estate | Commercial Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 2,562,582   2,562,582   2,690,528
Commercial real estate | Business banking portfolio          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 572,300   572,300   546,100
Commercial and industrial | Commercial Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 1,501,879   1,501,879   1,513,523
Commercial and industrial | Business banking portfolio          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 213,800   213,800   215,400
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 1,000   1,000   39,700
Commercial construction | Commercial Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 375,279   375,279   424,755
Commercial construction | Business banking portfolio          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 14,800   14,800   16,200
Consumer real estate | Business banking portfolio          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 377,700   377,700    
Consumer real estate | Consumer Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 1,352,965   1,352,965   1,127,585
Business banking | Commercial Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance 1,177,603   1,177,603   1,135,693
Business banking | Consumer Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance         357,900
CRE and commercial construction | Commercial Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment, outstanding balance $ 3,500,000   $ 3,500,000   $ 3,700,000
Combined percentage of commercial real estate and commercial construction in total commercial loans 67.30%   67.30%   68.00%
Combined percentage of commercial real estate and commercial construction in total portfolio loans 49.70%   49.70%   52.50%
Out of market exposure of combined portfolio 6.30%   6.30%   5.70%
Percentage of total loans out-of-state excluding contiguous states 3.10%   3.10%   3.00%