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Loans and Leases Held for Investment and Credit Quality - Additional Information (Details)
3 Months Ended
Mar. 31, 2022
USD ($)
Security
Mar. 31, 2021
USD ($)
Security
Dec. 31, 2021
USD ($)
Accounts Notes And Loans Receivable [Line Items]      
Loans greater than 90 days or more past due still accruing $ 0   $ 0
Interest income recognized on nonaccrual loans and leases 0 $ 0  
Accrued interest receivable on loans $ 31,200,000   $ 31,000,000.0
Number of TDRs with subsequent default | Security 0 1  
Recorded investment $ 10,021,000 $ 7,039,000  
Payment Deferral      
Accounts Notes And Loans Receivable [Line Items]      
Recorded investment 1,015,000 3,898,000  
Commercial Real Estate      
Accounts Notes And Loans Receivable [Line Items]      
Recorded investment 4,847,000 3,770,000  
Commercial Real Estate | Small Business Banking      
Accounts Notes And Loans Receivable [Line Items]      
Recorded investment $ 4,847,000 3,770,000  
Commercial Real Estate | Payment Deferral      
Accounts Notes And Loans Receivable [Line Items]      
Recorded investment   629,000  
Commercial Real Estate | Payment Deferral | Small Business Banking      
Accounts Notes And Loans Receivable [Line Items]      
Recorded investment   $ 629,000