Fair Value Measurements - OREO Measured at Fair Value on a Nonrecurring Basis (Details) - Level 3 - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
OREO measured at fair value on a nonrecurring basis
Carrying amount prior to remeasurement	$ 3,491	$ 5,258
Impairment recognized in results of operations	(727)	(939)
Fair value	$ 2,764	$ 4,319