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Loans - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]          
Loans $ 4,887,496   $ 4,887,496   $ 4,763,127
Loan balance, before allowance for credit loss and fee 4,928,842   4,928,842   4,805,596
Deferred loan fees 17,218   17,218   16,984
Loans, including fees 60,725 $ 58,039 181,465 $ 172,706  
Commercial and industrial          
Loans and Leases Receivable Disclosure [Line Items]          
Loans 345,027   345,027   526,327
Payment Protection Program (PPP)          
Loans and Leases Receivable Disclosure [Line Items]          
Loan balance, before allowance for credit loss and fee 640,410   640,410    
Payment Protection Program (PPP) | Commercial and industrial          
Loans and Leases Receivable Disclosure [Line Items]          
Loans 157,461   157,461   $ 326,770
Deferred loan fees 25,299   25,299    
Deferred loan costs 1,245   1,245    
Deferred fee accretion 6,013   6,013    
Loans, including fees $ 2,984 $ 2,603 $ 10,306 $ 4,959  
Payment Protection Program (PPP) | Commercial and industrial | Minimum          
Loans and Leases Receivable Disclosure [Line Items]          
Term of loan     24 months    
Payment Protection Program (PPP) | Commercial and industrial | Maximum          
Loans and Leases Receivable Disclosure [Line Items]          
Term of loan     60 months