Fair Value Measurements - Significant Unobservable Inputs (Level 3) Used in Valuation of Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Fair Value	$ 3,964	$ 9,251
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Fair Value	3,964	$ 9,251
Level 3 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Fair Value	$ 3,964
Valuation Technique	Appraised value of collateral less estimated costs to sell
Significant Unobservable Inputs	Estimated costs to sell
Level 3 | OREO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Fair Value	$ 2,662
Valuation Technique	Appraised value of property less estimated costs to sell
Significant Unobservable Inputs	Estimated costs to sell
Level 3 | Minimum | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Range of Inputs	4.00%
Level 3 | Minimum | OREO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Range of Inputs	4.00%
Level 3 | Maximum | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Range of Inputs	10.00%
Level 3 | Maximum | OREO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Range of Inputs	10.00%