Commitments, Contingencies, and Concentrations (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Unused lines of Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments whose contract amounts represent credit risk	$ 72,040	$ 74,858
Commitments to Extend Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments whose contract amounts represent credit risk	27,817	43,344
Standby letters of credit and financial guarantees written
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments whose contract amounts represent credit risk	$ 82	$ 37