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Loans - Loans Modified for Troubled Debt Restructuring (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
contract
Sep. 30, 2016
USD ($)
contract
Sep. 30, 2017
USD ($)
contract
Sep. 30, 2016
USD ($)
contract
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract 1 1 6 5
Pre-Modification Outstanding Recorded Investment $ 45 $ 56 $ 175 $ 1,087
Post-Modification Outstanding Recorded Investment $ 45 $ 47 $ 175 $ 1,075
Number of loans that subsequently defaulted within 12 months of modification | contract 0 0 0 0
Commercial        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract 1 0 4 1
Pre-Modification Outstanding Recorded Investment $ 45 $ 0 $ 118 $ 24
Post-Modification Outstanding Recorded Investment $ 45 $ 0 $ 118 $ 24
Commercial real estate | Real estate        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract 0 0 0 2
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 1,005
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 1,003
Commercial real estate | Construction and land development        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract 0 0 0 0
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 0
Residential | Real estate        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract 0 1 0 2
Pre-Modification Outstanding Recorded Investment $ 0 $ 56 $ 0 $ 58
Post-Modification Outstanding Recorded Investment $ 0 $ 47 $ 0 $ 48
Residential | Home equity        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract 0 0 2 0
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 57 $ 0
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 57 $ 0
Consumer        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract 0 0 0 0
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 0