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Loans - Loans Modified for Troubled Debt Restructuring (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
contract
Mar. 31, 2017
USD ($)
contract
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 1 8
Pre-Modification Outstanding Recorded Investment $ 11 $ 305
Post-Modification Outstanding Recorded Investment $ 11 $ 305
Number of loans that subsequently defaulted within 12 months of modification | contract 0 0
Commercial    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 0 5
Pre-Modification Outstanding Recorded Investment $ 0 $ 212
Post-Modification Outstanding Recorded Investment $ 0 $ 212
Commercial real estate | 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
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 $ 57
Residential | Real estate    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 1 1
Pre-Modification Outstanding Recorded Investment $ 11 $ 36
Post-Modification Outstanding Recorded Investment $ 11 $ 0
Residential | Home equity    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 0 2
Pre-Modification Outstanding Recorded Investment $ 0 $ 57
Post-Modification Outstanding Recorded Investment $ 0 $ 36
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