Fair Value Measurements - Quantitative Information (Details) - Level 3	Dec. 31, 2018	Dec. 31, 2017
Valuation, Cost Approach [Member] | Measurement Input, Cost to Sell [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired Loan, Measurement Input	0.08	0.08
Other Real Estate Owned, Measurement Input	0.08	0.0800
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired Loan, Measurement Input	0.0325	0.0325
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired Loan, Measurement Input	0.0980	0.0980