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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
loan
property
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Outstanding Balance $ 1,555,000   $ 1,555,000   $ 1,821,000
Real Estate Acquired Through Foreclosure 4,243,000   4,243,000   5,302,000
Impaired Financing Receivable, Related Allowance 0   $ 0   0
New Loans Identified as Troubled Debt Restructurings, Number of Loans | loan     0    
Loans and Leases Receivable, Gross 756,267,000   $ 756,267,000   714,105,000
Write downs 272,000 $ 99,000 546,000 $ 2,788,000  
Proceeds from Sale of Mortgage Loans Held-for-sale     1,760,000 1,739,000  
Commercial Rentals [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and Leases Receivable, Gross 81,300,000   $ 81,300,000    
Commercial Rentals [Member] | Loans Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration Risk, Percentage     10.80%    
Hospitality Lodging Industry [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and Leases Receivable, Gross 53,800,000   $ 53,800,000    
Hospitality Lodging Industry [Member] | Loans Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration Risk, Percentage     7.10%    
Troubled Debt Restructured Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Modifications, Recorded Investment 1,300,000   $ 1,300,000   1,500,000
Impaired Financing Receivable, Related Allowance 0   $ 0   0
New Loans Identified as Troubled Debt Restructurings, Number of Loans | loan     0    
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     $ 55,000 2,519,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan     1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     $ 175,000    
Residential Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Real Estate Acquired Through Foreclosure 0   $ 0    
Number Of Properties Under Foreclosure Proceedings | property     8    
Mortgage Loans in Process of Foreclosure, Amount 494,000   $ 494,000    
Impaired Financing Receivable, Related Allowance 0   0   0
Loans and Leases Receivable, Gross 235,508,000   235,508,000   237,177,000
Write downs   15,000 83,000 32,000  
Proceeds from Sale of Mortgage Loans Held-for-sale 0 0 0 1,700,000  
Gross Realized Gains on Loans       54,000  
Gross Realized Losses on Loans       0  
Commercial Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired Financing Receivable, Related Allowance 0   0   0
Loans and Leases Receivable, Gross 344,960,000   344,960,000   $ 320,187,000
Write downs 212,000 $ 28,000 308,000 $ 2,670,000  
Proceeds from Sale of Mortgage Loans Held-for-sale 1,700,000        
Gross Realized Gains on Loans 67,000        
Delaware Bancshares, Inc. Acquisition [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Outstanding Balance $ 1,397,000   1,397,000    
Assets, Fair Value Adjustment     499,000    
Minimum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Annual Loan Review threshold, amount     $ 1,500,000