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Loans - Troubled Debt Restructuring (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
contract
loan
Dec. 31, 2017
USD ($)
contract
Dec. 31, 2016
USD ($)
contract
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Number of Contracts | contract 1 8 8
Pre-Modification Outstanding Recorded Investment $ 11 $ 305 $ 1,351
Post-Modification Outstanding Recorded Investment $ 11 305 $ 1,339
Number of loans that subsequently defaulted within 12 months of modification 0   0
Type of modification $ 11 305 $ 1,339
ALLL impact 0 138 $ 1
Loans in the process of foreclosure 112    
Residential OREO $ 719 $ 629  
Commercial      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Number of Contracts | contract 0 5 2
Pre-Modification Outstanding Recorded Investment $ 0 $ 212 $ 24
Post-Modification Outstanding Recorded Investment 0 $ 212 24
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 0 212 24
ALLL impact $ 0 $ 137 $ 0
Commercial real estate | Real estate      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Number of Contracts | contract 0 0 2
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 1,005
Post-Modification Outstanding Recorded Investment 0 0 1,003
Type of modification 0 0 1,003
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 1 4
Pre-Modification Outstanding Recorded Investment $ 11 $ 36 $ 322
Post-Modification Outstanding Recorded Investment 11 $ 36 312
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 11 36 312
ALLL impact $ 0 $ 0 $ 1
Residential | Home equity      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Number of Contracts | contract 0 2 0
Pre-Modification Outstanding Recorded Investment $ 0 $ 57 $ 0
Post-Modification Outstanding Recorded Investment 0 57 0
Type of modification 0 57 0
ALLL impact $ 0 $ 1 $ 0
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 0
Type of modification 0 0 0
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 0
Type of modification 0 0 0
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 11 305 1,339
Type of modification 11 305 1,339
Structure | Commercial      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 0 212 24
Type of modification 0 212 24
Structure | Commercial real estate | Real estate      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 0 0 1,003
Type of modification 0 0 1,003
Structure | Residential | Real estate      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 11 36 312
Type of modification 11 36 312
Structure | Residential | Home equity      
Loans modified as troubled debt restructurings included in impaired loan balances [Abstract]      
Post-Modification Outstanding Recorded Investment 0 57 0
Type of modification 0 57 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