Fair Value - Valuation Methodology and Unobservable Inputs (Details) - Non-Recurring Basis - Significant Unobservable Inputs (Level 3) - item	Mar. 31, 2019	Dec. 31, 2018
Impaired loans carried at fair value of collateral | Minimum
Fair Value Pending Completion
Adjustment for differences between the comparable sales (as a percent)	(3)	(3)
Impaired loans carried at fair value of collateral | Maximum
Fair Value Pending Completion
Adjustment for differences between the comparable sales (as a percent)	(1)	(1)
Impaired loans carried at fair value of collateral | Weighted Average
Fair Value Pending Completion
Adjustment for differences between the comparable sales (as a percent)	(2.57)	(2.83)
Real estate owned
Fair Value Pending Completion
Adjustment for differences between the comparable sales (as a percent)	(11)	(11)
Real estate owned | Weighted Average
Fair Value Pending Completion
Adjustment for differences between the comparable sales (as a percent)	(10.85)	(10.85)