Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Impaired loans measured at fair value on a nonrecurring basis
Impaired loans	$ 8,552	$ 21,686
OREO	2,764	4,319
Total financial assets	11,316	26,005
Level 1
Impaired loans measured at fair value on a nonrecurring basis
Impaired loans	0	0
OREO	0	0
Total financial assets	0	0
Level 2
Impaired loans measured at fair value on a nonrecurring basis
Impaired loans	0	0
OREO	0	0
Total financial assets	0	0
Level 3
Impaired loans measured at fair value on a nonrecurring basis
Impaired loans	8,552	21,686
OREO	2,764	4,319
Total financial assets	$ 11,316	$ 26,005