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Loans and Leases Held for Investment and Credit Quality - Additional Information (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
SecurityLoan
Dec. 31, 2018
USD ($)
SecurityLoan
Dec. 31, 2017
USD ($)
SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Theoretical increase in interest if interest on nonaccrual loans had been accrued in accordance with original terms | $ $ 3,400,000 $ 2,800,000 $ 1,100,000
Credit exposure threshold for impairment evaluation (less than) | $ $ 100,000    
Number of TDRs with subsequent default | SecurityLoan 2 0 1
Number of TDR contracts | SecurityLoan 11 11 3
Payment Deferral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of TDR contracts | SecurityLoan 2   2
Commercial Real Estate | Healthcare | Payment Deferral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of TDR contracts | SecurityLoan 1    
Recorded investment | $ $ 1,800,000    
Commercial & Industrial | Healthcare | Payment Deferral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of TDR contracts | SecurityLoan 1    
Recorded investment | $ $ 574,000    
Commercial & Industrial | Independent Pharmacy | Payment Deferral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment | $     $ 1,100,000