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Loans - Loans Modified for Troubled Debt Restructuring (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
contract
Mar. 31, 2016
USD ($)
contract
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 3 1
Pre-Modification Outstanding Recorded Investment $ 89 $ 68
Post-Modification Outstanding Recorded Investment $ 89 $ 66
Number of loans that subsequently defaulted within 12 months of modification | contract 0 0
Commercial    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 2 0
Pre-Modification Outstanding Recorded Investment $ 68 $ 0
Post-Modification Outstanding Recorded Investment $ 68 $ 0
Commercial real estate | Real estate    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 0 1
Pre-Modification Outstanding Recorded Investment $ 0 $ 68
Post-Modification Outstanding Recorded Investment $ 0 $ 66
Commercial real estate | Construction and land development    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 0 0
Pre-Modification Outstanding Recorded Investment $ 0 $ 0
Post-Modification Outstanding Recorded Investment $ 0 $ 0
Residential | Real estate    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 0 0
Pre-Modification Outstanding Recorded Investment $ 0 $ 0
Post-Modification Outstanding Recorded Investment $ 0 $ 0
Residential | Home equity    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 1 0
Pre-Modification Outstanding Recorded Investment $ 21 $ 0
Post-Modification Outstanding Recorded Investment $ 21 $ 0
Consumer    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 0 0
Pre-Modification Outstanding Recorded Investment $ 0 $ 0
Post-Modification Outstanding Recorded Investment $ 0 $ 0