Fair Value of Financial Instruments - Level 3 Quantitative Information (Details) - Level 3	Sep. 30, 2018	Dec. 31, 2017
Discounted appraised value | Selling cost
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Impaired loans	0.0800	0.0800
Other real estate owned, net	0.0800	0.0800
Discounted cash flow analysis | Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Impaired loans	0.0325	0.0325
Discounted cash flow analysis | Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Impaired loans	0.0980	0.0980