Fair Value of Financial Instruments - Hierarchy Table - Noncrecurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value Disclosures
Financial assets, impaired loans	$ 1,569	$ 1,445
Level 1
Fair Value Disclosures
Financial assets, impaired loans	0	0
Level 2
Fair Value Disclosures
Financial assets, impaired loans	0	0
Level 3
Fair Value Disclosures
Financial assets, impaired loans	$ 1,569	$ 1,445