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Loans - Troubled Debt Restructuring (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
contract
Dec. 31, 2016
USD ($)
contract
Dec. 31, 2015
USD ($)
contract
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Number of Contracts | contract 8 8 8
Pre-Modification Outstanding Recorded Investment $ 305 $ 1,351 $ 1,097
Post-Modification Outstanding Recorded Investment 305 $ 1,339 $ 1,082
Number of loans that subsequently defaulted within 12 months of modification | contract   0 0
Type of Modification 305 $ 1,339 $ 1,082
ALLL impact 138 1 $ 20
Loans in the process of foreclosure 463    
Residential OREO $ 629 $ 653  
Commercial      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Number of Contracts | contract 5 2 0
Pre-Modification Outstanding Recorded Investment $ 212 $ 24 $ 0
Post-Modification Outstanding Recorded Investment $ 212 24 0
Number of loans that subsequently defaulted within 12 months of modification | contract 3    
Loans that defaulted within twelve months of modification $ 109,000    
Type of Modification 212 24 0
ALLL impact $ 137 $ 0 $ 0
Commercial real estate | Real estate      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Number of Contracts | contract 0 2 3
Pre-Modification Outstanding Recorded Investment $ 0 $ 1,005 $ 394
Post-Modification Outstanding Recorded Investment 0 1,003 394
Type of Modification 0 1,003 394
ALLL impact $ 0 $ 0 $ 0
Residential | Real estate      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Number of Contracts | contract 1 4 4
Pre-Modification Outstanding Recorded Investment $ 36 $ 322 $ 596
Post-Modification Outstanding Recorded Investment $ 36 312 583
Number of loans that subsequently defaulted within 12 months of modification | contract 1    
Loans that defaulted within twelve months of modification $ 143,000    
Type of Modification 36 312 583
ALLL impact $ 0 $ 1 $ 19
Residential | Home equity      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Number of Contracts | contract 2 0 1
Pre-Modification Outstanding Recorded Investment $ 57 $ 0 $ 107
Post-Modification Outstanding Recorded Investment 57 0 105
Type of Modification 57 0 105
ALLL impact $ 1 $ 0 $ 1
Consumer      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Number of Contracts | contract 0 0 0
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment 0 0 0
Type of Modification 0 0 0
ALLL impact 0 0 0
Rate      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 0 0 105
Type of Modification 0 0 105
Rate | Commercial      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 0 0 0
Type of Modification 0 0 0
Rate | Commercial real estate | Real estate      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 0 0 0
Type of Modification 0 0 0
Rate | Residential | Real estate      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 0 0 0
Type of Modification 0 0 0
Rate | Residential | Home equity      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 0 0 105
Type of Modification 0 0 105
Rate | Consumer      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 0 0 0
Type of Modification 0 0 0
Structure      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 305 1,339 977
Type of Modification 305 1,339 977
Structure | Commercial      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 212 24 0
Type of Modification 212 24 0
Structure | Commercial real estate | Real estate      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 0 1,003 394
Type of Modification 0 1,003 394
Structure | Residential | Real estate      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 36 312 583
Type of Modification 36 312 583
Structure | Residential | Home equity      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 57 0 0
Type of Modification 57 0 0
Structure | Consumer      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 0 0 0
Type of Modification $ 0 $ 0 $ 0