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Allowance for Loan Losses (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Ending Balance Attributable to Loans            
Individually evaluated for impairment $ 34   $ 625      
Collectively evaluated for impairment 20,267   19,284      
Ending Balance 20,301 $ 20,071 19,909 $ 19,802 $ 19,680 $ 18,773
Loans            
Individually evaluated for impairment 9,435   10,082      
Collectively evaluated for impairment 1,938,625   1,901,080      
Total 1,949,587   1,913,022      
Commercial Portfolio Segment [Member]            
Ending Balance Attributable to Loans            
Individually evaluated for impairment 34   619      
Collectively evaluated for impairment 9,303   9,662      
Ending Balance 9,337 9,498 10,281 9,937 10,223 9,731
Loans            
Individually evaluated for impairment 5,063   9,619      
Collectively evaluated for impairment 1,151,707   1,134,701      
Total 1,158,297   1,146,180      
Residential Portfolio Segment [Member]            
Ending Balance Attributable to Loans            
Individually evaluated for impairment 0   6      
Collectively evaluated for impairment 1,340   1,449      
Ending Balance 1,340 1,382 1,455 1,519 1,514 1,553
Loans            
Individually evaluated for impairment 4,372   463      
Collectively evaluated for impairment 440,335   436,944      
Total 444,707   437,407      
Consumer Portfolio Segment [Member]            
Ending Balance Attributable to Loans            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 7,537   6,709      
Ending Balance 7,537 7,131 6,709 6,638 6,218 5,767
Loans            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 346,583   329,435      
Total 346,583   329,435      
Unallocated            
Ending Balance Attributable to Loans            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 2,087   1,464      
Ending Balance 2,087 $ 2,060 1,464 $ 1,708 $ 1,725 $ 1,722
Financial Asset Acquired with Credit Deterioration [Member]            
Ending Balance Attributable to Loans            
Financing Receivable, Allowance for Credit Losses 0   0      
Loans            
Financing Receivable, Net 1,527   1,860      
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Portfolio Segment [Member]            
Ending Balance Attributable to Loans            
Financing Receivable, Allowance for Credit Losses 0   0      
Loans            
Financing Receivable, Net 1,527   1,860      
Financial Asset Acquired with Credit Deterioration [Member] | Residential Portfolio Segment [Member]            
Ending Balance Attributable to Loans            
Financing Receivable, Allowance for Credit Losses 0   0      
Loans            
Financing Receivable, Net 0   0      
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member]            
Ending Balance Attributable to Loans            
Financing Receivable, Allowance for Credit Losses 0   0      
Loans            
Financing Receivable, Net 0   0      
Financial Asset Acquired with Credit Deterioration [Member] | Unallocated            
Ending Balance Attributable to Loans            
Financing Receivable, Allowance for Credit Losses $ 0   $ 0