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Premises and Equipment - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Depreciation and amortization on premises and equipment $ 1,071,000 $ 993,000
Operating leases rent expense gross 721,000 684,000
Sublease and lease income 81,000 222,000
Capital Lease    
Property Plant And Equipment [Line Items]    
Purchase of ATM equipment 5,000 18,000
Depreciation related to the capitalized equipment 65,000 52,000
Silver Lake and Everett Facilities    
Property Plant And Equipment [Line Items]    
Operating leases rent expense gross $ 1,178,000 $ 1,065,000
Minimum    
Property Plant And Equipment [Line Items]    
Operating leases lease term 3 years  
Maximum    
Property Plant And Equipment [Line Items]    
Operating leases lease term 20 years