Fair Value Measurements - Assets Measured on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets:
Impaired loans, net of valuation allowance	$ 237	$ 171
Other real estate owned, net	1,353	869
Level 1
Assets:
Impaired loans, net of valuation allowance	0	0
Other real estate owned, net	0	0
Level 2
Assets:
Impaired loans, net of valuation allowance	0	0
Other real estate owned, net	0	0
Level 3
Assets:
Impaired loans, net of valuation allowance	237	171
Other real estate owned, net	$ 1,353	$ 869