Commitments and Contingencies (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Probable loan loss experience on unfunded obligations [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Estimate of possible loss	$ 225	$ 125
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	322,070	259,415
Undisbursed lines of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 320,275	257,557
Undisbursed lines of credit | Minimum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit, term of agreement	1 month
Undisbursed lines of credit | Maximum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit, term of agreement	12 months
Undisbursed portions of construction loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 91,419	43,208
Standby letters of credit and financial guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 1,795	$ 1,858
Standby letters of credit and financial guarantees | Maximum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit, term of agreement	1 year