Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments represent off-balance sheet credit risk	$ 84,114	$ 81,536
Future loan commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments represent off-balance sheet credit risk	3,861	3,157
Undisbursed construction loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments represent off-balance sheet credit risk	11,549	16,289
Undisbursed home equity lines of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments represent off-balance sheet credit risk	9,391	9,532
Undisbursed commercial and other line of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments represent off-balance sheet credit risk	57,150	50,773
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments represent off-balance sheet credit risk	$ 2,163	$ 1,785