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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Loans And Leases Receivable Disclosure [Line Items]      
Increase (decrease) in allowance for loan and lease losses $ 6,700,000 $ 8,500,000 $ 5,800,000
Commitments outstanding on troubled debt restructurings 500,000 500,000 0
Recorded investment in troubled debt restructurings that subsequently defaulted within twelve months 348,000 340,000 144,000
Reserve for unfunded commitments 1,200,000 1,200,000  
Provisions for unfunded commitments 80,000 317,000 162,000
Charge-offs or recoveries related to reserve for unfunded commitments 0 0 0
Acquired Impaired Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Increase (decrease) in allowance for loan and lease losses 41,000 (1,100,000) 2,300,000
Individually Evaluated For Impairment      
Loans And Leases Receivable Disclosure [Line Items]      
Increase (decrease) in allowance for loan and lease losses 4,000,000 2,700,000 2,900,000
Collectively Evaluated For Impairment      
Loans And Leases Receivable Disclosure [Line Items]      
Increase (decrease) in allowance for loan and lease losses $ 2,700,000 $ 7,000,000 $ 572,000