Fair Value Measurement - Summary of Financial Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Level 1 [Member]
Assets [Abstract]
Mortgage loans held for sale	$ 0
Level 2 [Member]
Assets [Abstract]
Mortgage loans held for sale	1,500
Level 3 [Member]
Assets [Abstract]
Mortgage loans held for sale	0
Fair Value on a Nonrecurring Basis [Member]
Assets [Abstract]
Mortgage loans held for sale	1,500
Impaired loans, net	2,231	$ 2,438
Other real estate owned, net	1,356	1,356
Fair Value on a Nonrecurring Basis [Member] | Level 1 [Member]
Assets [Abstract]
Mortgage loans held for sale	0
Impaired loans, net	0	0
Other real estate owned, net	0	0
Fair Value on a Nonrecurring Basis [Member] | Level 2 [Member]
Assets [Abstract]
Mortgage loans held for sale	1,500
Impaired loans, net	0	0
Other real estate owned, net	0	0
Fair Value on a Nonrecurring Basis [Member] | Level 3 [Member]
Assets [Abstract]
Mortgage loans held for sale	0
Impaired loans, net	2,231	2,438
Other real estate owned, net	$ 1,356	$ 1,356