Fair Value Measurements - Assets Measured on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Level 1
Assets:
Loans held for sale	$ 0	$ 0
Level 2
Assets:
Loans held for sale	1,252	640
Level 3
Assets:
Loans held for sale	0	0
Fair Value, Measurements, Nonrecurring
Assets:
Loans held for sale	1,252	640
Impaired loans, net of valuation allowance	168	171
Other real estate owned, net	646	869
Fair Value, Measurements, Nonrecurring | Level 1
Assets:
Loans held for sale	0	0
Impaired loans, net of valuation allowance	0	0
Other real estate owned, net	0	0
Fair Value, Measurements, Nonrecurring | Level 2
Assets:
Loans held for sale	1,252	640
Impaired loans, net of valuation allowance	0	0
Other real estate owned, net	0	0
Fair Value, Measurements, Nonrecurring | Level 3
Assets:
Loans held for sale	0	0
Impaired loans, net of valuation allowance	168	171
Other real estate owned, net	$ 646	$ 869