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Loans & Leases and Allowance for Credit Losses, Loans & Lease by Class Modified as Troubled Debt Restructured Loans (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Loan
Jun. 30, 2017
USD ($)
Loan
Jun. 30, 2018
USD ($)
Loan
Jun. 30, 2017
USD ($)
Loan
Dec. 31, 2017
USD ($)
Loan
Troubled Debt Restructured Loans [Abstract]          
Specific reserves $ 624 $ 831 $ 624 $ 831 $ 623
Commitments to lend additional amounts to customers with outstanding loans that are classified as troubled debt restructurings $ 0 $ 0 $ 0 $ 0 $ 0
Loans by class modified as troubled debt restructured loans [Abstract]          
Number of Loans | Loan 1 0 1 0 6
Pre-Modification Outstanding Recorded Investment $ 175   $ 175   $ 852
Post-Modification Outstanding Recorded Investment $ 163   $ 163   $ 808
Number of loans modified as troubled debt restructurings with subsequent payment defaults | Loan 0 0 0 0 0
Threshold period after which loan is considered to be in payment default     90 days    
Stated Interest Rate Reduction [Member]          
Troubled Debt Restructured Loans [Abstract]          
Period of modifications     5 years    
Stated Interest Rate Reduction [Member] | Minimum [Member]          
Troubled Debt Restructured Loans [Abstract]          
Period of modifications         3 years
Stated Interest Rate Reduction [Member] | Maximum [Member]          
Troubled Debt Restructured Loans [Abstract]          
Period of modifications         5 years
Extended Maturity [Member]          
Troubled Debt Restructured Loans [Abstract]          
Period of modifications     10 years    
Extended Maturity [Member] | Minimum [Member]          
Troubled Debt Restructured Loans [Abstract]          
Period of modifications         3 years
Extended Maturity [Member] | Maximum [Member]          
Troubled Debt Restructured Loans [Abstract]          
Period of modifications         10 years
Performing [Member]          
Troubled Debt Restructured Loans [Abstract]          
Troubled debt restructured loans $ 6,400 $ 6,000 $ 6,400 $ 6,000 $ 6,300
Residential 1st Mortgages [Member]          
Loans by class modified as troubled debt restructured loans [Abstract]          
Number of Loans | Loan 1   1   2
Pre-Modification Outstanding Recorded Investment $ 175   $ 175   $ 673
Post-Modification Outstanding Recorded Investment $ 163   $ 163   $ 630
Home Equity Lines & Loans [Member]          
Loans by class modified as troubled debt restructured loans [Abstract]          
Number of Loans | Loan         1
Pre-Modification Outstanding Recorded Investment         $ 32
Post-Modification Outstanding Recorded Investment         $ 32
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 Outstanding Recorded 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 Outstanding Recorded Investment         $ 8