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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment $ 0    
Impaired Financing Receivable, Average Recorded Investment 1,232,000 $ 2,696,000 $ 9,015,000
Impaired Financing Receivable, Interest Income, Cash Basis Method 56,000 $ 91,000 532,000
Mortgage Loans on Real Estate, Number of Foreclosures | loan   1  
Mortgage Loans on Real Estate, Foreclosures   $ 5,000,000  
Foreclosed Real Estate Expense 1,164,000 680,000 911,000
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Outstanding Balance 1,444,000 1,821,000  
Real Estate Acquired Through Foreclosure 1,661,000 5,302,000  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,247,000 2,624,000  
Annual Loan Review threshold, amount 1,500,000    
Loans and Leases Receivable, Gross 764,335,000 714,105,000  
Charge Offs 1,220,000 2,951,000 3,198,000
Proceeds from Sale of Mortgage Loans Held-for-sale   1,739,000 4,410,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 163,000 163,000 515,000
Servicing Asset at Amortized Cost 29,000,000 35,500,000  
Customer Concentration Risk [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Charge Offs 762,000 31,000 643,000
Commercial Rentals [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 68,100,000    
Concentration Risk, Percentage 63.60%    
Hospitality Lodging Industry [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 53,900,000    
Concentration Risk, Percentage 50.40%    
Troubled Debt Restructured Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 1,100,000 1,500,000  
Impaired Financing Receivable, Related Allowance $ 0 $ 0  
Mortgage Loans on Real Estate, Number of Foreclosures | loan 1 1  
Mortgage Loans on Real Estate, Foreclosures   $ 322,000  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down $ 55,000 2,600,000  
Financing Receivable, Modifications, Recorded Investment   82,000  
Residential Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired Financing Receivable, Related Allowance 0 0  
Impaired Financing Receivable, Average Recorded Investment 23,000 25,000 159,000
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 0 4,000
Real Estate Acquired Through Foreclosure $ 34,000    
Number Of Properties Under Foreclosure Proceedings | loan 15    
Mortgage Loans in Process of Foreclosure, Amount $ 1,166,000    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 23,000 23,000  
Loans and Leases Receivable, Gross 235,759,000 237,177,000  
Charge Offs 83,000 123,000 224,000
Gross Realized Gains on Loans   54,000 113,000
Gross Realized Losses on Loans   $ 0 $ 0
Historical loss factor   0.80% 0.70%
Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired Financing Receivable, Average Recorded Investment 1,209,000 $ 2,671,000 $ 8,847,000
Impaired Financing Receivable, Interest Income, Cash Basis Method 56,000 91,000 526,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,224,000 2,601,000  
Loans and Leases Receivable, Gross 342,934,000 320,187,000  
Charge Offs 902,000 2,711,000 2,883,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) 22,747,000    
Allowance for Loan and Lease Losses, Adjustments, Other   419,000  
Allowance for Loan and Lease Losses, Period Increase (Decrease) (642,000) (883,000)  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses     1,596,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases     1,610,000
Allowance for Loan and Lease Losses, Real Estate $ 5,265,000 $ 4,623,000 $ 5,506,000
Historical loss factor 0.74% 0.80%  
Impaired Loans Requiring Allowance [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment $ 0 $ 0  
Impaired Loans Not Requiring Allowance [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,247,000 2,624,000  
Charge Offs $ 277,000 $ 831,000