Fair Value Measurement - Summary of Financial Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value on a Nonrecurring Basis [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets [Abstract]
Impaired loans, net	$ 2,514	$ 2,438
Other real estate owned, net	1,356	1,356
Level 1 [Member]
Assets [Abstract]
Impaired loans, net	0	0
Other real estate owned, net	0	0
Level 2 [Member]
Assets [Abstract]
Impaired loans, net	0	0
Other real estate owned, net	0	0
Level 3 [Member]
Assets [Abstract]
Impaired loans, net	2,514	2,438
Other real estate owned, net	$ 1,356	$ 1,356