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Loans Receivable - Classification of Loans (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loans and Leases Receivable Disclosure [Line Items]        
Loans receivable, gross $ 1,010,334 $ 1,002,260    
Deferred origination fees, net (2,406) (1,992)    
Allowance for loan losses (11,347) (11,308) $ (10,157) $ (10,033)
Loans receivable, net 996,581 988,960    
Residential | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Loans receivable, gross 421,346 407,844    
Allowance for loan losses (3,939) (3,541) (3,175) (3,137)
Commercial        
Loans and Leases Receivable Disclosure [Line Items]        
Loans receivable, gross 120,191 122,264    
Allowance for loan losses (1,451) (1,578) (1,414) (1,497)
Commercial | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Loans receivable, gross 277,905 278,691    
Allowance for loan losses $ (2,894) (3,003) (2,933) (2,860)
Fixed interest rate term 5 years      
Initial commitment term 10 years      
Amortization period 25 years      
Construction | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Loans receivable, gross $ 157,338 157,586    
Allowance for loan losses (2,062) (2,093) (1,804) (1,646)
Consumer | Credit card        
Loans and Leases Receivable Disclosure [Line Items]        
Loans receivable, gross 32,359 34,673    
Allowance for loan losses (992) (1,084) (823) (885)
Consumer | Credit card | Savings Deposits        
Loans and Leases Receivable Disclosure [Line Items]        
Loans receivable, gross $ 30,800 32,500    
Repayment history used for scoring model 6 months      
Consumer | Other consumer        
Loans and Leases Receivable Disclosure [Line Items]        
Loans receivable, gross $ 1,195 1,202    
Allowance for loan losses $ (9) $ (9) $ (8) $ (8)
Minimum | Construction | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Initial commitment term 12 months      
Maximum | Construction | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Initial commitment term 18 months      
Owner Occupied Real Estate | Residential | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Initial commitment term 30 years      
Owner Occupied Real Estate | Commercial | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Loans receivable, gross $ 129,200      
Percent of real estate portfolio 49.00%      
Owner Occupied Real Estate | Construction | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Principal to collateral value ratio, percent 80.00%      
Owner Occupied Real Estate | Minimum | Residential | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Fixed interest rate term 5 years      
Owner Occupied Real Estate | Maximum | Residential | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Fixed interest rate term 7 years      
Investor Real Estate | Residential | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Initial commitment term 25 years      
Balloon payment period 5 years      
Debt service coverage ratio 1.15      
Investor Real Estate | Construction | Real estate        
Loans and Leases Receivable Disclosure [Line Items]        
Principal to collateral value ratio, percent 75.00%