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Allowance for Credit Losses, Loans by Class Modified as Troubled Debt Restructured Loans (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Loan
Dec. 31, 2016
USD ($)
Loan
Financing Receivable, Modifications [Line Items]    
Specific reserves $ 623 $ 736
Troubled debt restructured loans   5,900
Commitments to lend additional amounts to customers with outstanding loans that are classified as troubled debt restructurings $ 0 $ 0
Loans by class modified as troubled debt restructured loans [Abstract]    
Number of Loans | Loan 6 5
Pre-Modification Outstanding Recorded Investment $ 852 $ 706
Post-Modification Recorded Outstanding Investment 808 679
Increase in allowance for loan losses due to TDR 0 0
TDR's charge-offs $ 44 $ 27
Number of loans modified as troubled debt restructurings with subsequent payment defaults | Loan 0 0
Threshold period after which loan is considered to be in payment default 90 days  
Stated Interest Rate Reduction [Member] | Minimum [Member]    
Financing Receivable, Modifications [Line Items]    
Period of modifications 3 years 5 years
Stated Interest Rate Reduction [Member] | Maximum [Member]    
Financing Receivable, Modifications [Line Items]    
Period of modifications 5 years 10 years
Extended Maturity [Member] | Minimum [Member]    
Financing Receivable, Modifications [Line Items]    
Period of modifications 3 years 5 years
Extended Maturity [Member] | Maximum [Member]    
Financing Receivable, Modifications [Line Items]    
Period of modifications 10 years 10 years
Performing [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans $ 6,300 $ 4,500
Commercial Real Estate [Member]    
Loans by class modified as troubled debt restructured loans [Abstract]    
Number of Loans | Loan   1
Pre-Modification Outstanding Recorded Investment   $ 112
Post-Modification Recorded Outstanding Investment   $ 112
Residential 1st Mortgages [Member]    
Loans by class modified as troubled debt restructured loans [Abstract]    
Number of Loans | Loan 2 2
Pre-Modification Outstanding Recorded Investment $ 673 $ 289
Post-Modification Recorded Outstanding Investment $ 630 $ 281
Home Equity Lines and Loans [Member]    
Loans by class modified as troubled debt restructured loans [Abstract]    
Number of Loans | Loan 1 2
Pre-Modification Outstanding Recorded Investment $ 32 $ 305
Post-Modification Recorded Outstanding Investment $ 32 $ 286
Commercial [Member]    
Loans by class modified as troubled debt restructured loans [Abstract]    
Number of Loans | Loan 2  
Pre-Modification Outstanding Recorded Investment $ 138  
Post-Modification Recorded Outstanding Investment $ 138  
Consumer & Other [Member]    
Loans by class modified as troubled debt restructured loans [Abstract]    
Number of Loans | Loan 1  
Pre-Modification Outstanding Recorded Investment $ 9  
Post-Modification Recorded Outstanding Investment $ 8