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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
contract
Sep. 30, 2021
USD ($)
contract
Dec. 31, 2021
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans $ 6,690,845   $ 6,690,845   $ 5,925,029
Net deferred costs 30,100   30,100   31,000
Accrued interest receivable 17,600   17,600   14,700
Interest income from securities with no related allowance 200 $ 300 1,400 $ 900  
Allowance for credit loss on TDRs 100 200 $ 100 $ 200  
Number of loans under trouble debt restructuring | contract     1 2  
Amount of loans in default     $ 2 $ 100  
Interest income related to impaired loans with impairment measured on present value of expected future cash flows $ 13 $ 9 33 $ 20  
Loans          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Remaining fair value adjustment for loans acquired     $ 19,100   $ 23,100
Percentage of fair value adjustment for loans acquired 1.80%   1.80%   2.30%
Portfolio Loans          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans $ 5,653,357   $ 5,653,357   $ 4,929,672
Commercial real estate - non owner-occupied          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans 2,107,614   2,107,614   1,736,439
Commercial real estate - non owner-occupied | Portfolio Loans          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans 1,568,138   1,568,138   1,278,180
Commercial real estate - non owner-occupied | Scenario, Adjustment          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans 100,000   100,000    
Residential real estate          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans 1,599,765   1,599,765   1,425,354
Residential real estate | Portfolio Loans          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans 1,488,359   1,488,359   1,261,306
Residential real estate | Scenario, Adjustment          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans (100,000)   (100,000)    
Paycheck Protection Program          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans 5,294   5,294   91,107
Paycheck Protection Program | Portfolio Loans          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans $ 1,616   $ 1,616   69,503
Net deferred fees         $ 2,400