Fair Value Measurements - Non-Recurring Assets (Details) - Nonrecurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Impaired loans
Fair Value Measurements [Abstract]
Total assets, fair value	$ 17,879	$ 18,704
Impaired loans | Level I
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Impaired loans | Level II
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Impaired loans | Level III
Fair Value Measurements [Abstract]
Total assets, fair value	17,879	18,704
Other real estate owned
Fair Value Measurements [Abstract]
Total assets, fair value	325	402
Other real estate owned | Level I
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Other real estate owned | Level II
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Other real estate owned | Level III
Fair Value Measurements [Abstract]
Total assets, fair value	$ 325	$ 402