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Fair Value - Fair Value of Assets and Liabilities on Non Recurring Basis (Details) - Non-Recurring - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain (loss) on impaired loans $ 0 $ (65) $ (332) $ (234)
Gain (loss) on other real estate owned (100) 28 (282) 24
Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired loans 0 0 0 0
Other real estate owned 0 0 0 0
Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired loans 1,603 0 3,982 2,747
Other real estate owned 1,520 731 2,030 1,008
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired loans 0 0 0 0
Other real estate owned 0 0 0 0
Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired loans 1,603 0 3,982 2,747
Other real estate owned $ 1,520 $ 731 $ 2,030 $ 1,008