Disclosures about Fair Value of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets and liabilities measured at fair value on a nonrecurring basis
Impaired loans (collateral dependent)	$ 2,126	$ 225
Level 3
Assets and liabilities measured at fair value on a nonrecurring basis
Impaired loans (collateral dependent)	$ 2,126	$ 225

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