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Loans and Allowance for Credit Losses (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
property
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans $ 871,525   $ 1,034,605 $ 871,525
Allowance period increase due to revised methodology used in calculation 1,100      
Allowance period adjusted amoung due to revised methodology used in calculation   $ (850)    
Other real estate owned, net 2,477   $ 2,302 2,477
Number of properties in other real estate owned | property     1  
Residential Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 325,768   $ 384,777 325,768
Other real estate owned, net 92   15 $ 92
Number of properties in other real estate owned | property       3
Consumer Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 6,639   6,951 $ 6,639
Mortgage loans in process of foreclosure, amount 687   105 687
Special Mention [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 22,637   27,074 22,637
Special Mention [Member] | Residential Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 6,646   6,725 6,646
Special Mention [Member] | Impaired Nonaccrual Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans     0  
Substandard [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 22,691   20,092 22,691
Substandard [Member] | Residential Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 6,880   5,904 6,880
Substandard [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 99     99
Substandard [Member] | Impaired Nonaccrual Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans $ 9,000   7,200 $ 9,000
Doubtful [Member] | Impaired Nonaccrual Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans     $ 0