Fair Value - Assets and Liabilities Subject to Fair Value Adjustments (Impairment) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	$ 273	$ 56
Impaired collateral-dependent loans	2,300	2,625
OREO, Net Provision (Credit)	(110)	(196)
Impaired collateral-dependent loans, Net Provision (Credit)	(437)	(335)
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	0	0
Impaired collateral-dependent loans	0	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	0	0
Impaired collateral-dependent loans	0	0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	273	56
Impaired collateral-dependent loans	$ 2,300	$ 2,625