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Allowance for Loan Losses and Credit Quality (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
property
loan
Jun. 30, 2016
loan
Jun. 30, 2017
USD ($)
property
loan
Jun. 30, 2016
loan
Dec. 31, 2016
USD ($)
Financing Receivable, Recorded Investment [Line Items]          
Other Real Estate Owned $ 356   $ 356   $ 166
Number of contracts | loan 0 0 1 0  
Recorded investment     $ 2,300    
Number of troubled debt restructurings | loan     1 0  
Amount of troubled debt restructuring that subsequently defaulted     $ 458    
Multifamily [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Number of multi-family residential properties | property 1   1    
Multifamily [Member] | Fair Value [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Other Real Estate Owned $ 190   $ 190    
Receivables Acquired with Deteriorated Credit Quality [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Carrying amount 854   854   1,121
Receivables Acquired with Deteriorated Credit Quality [Member] | Performing loans [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Carrying amount $ 0   $ 0   $ 439