Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial assets - Carrying Amount
Cash and cash equivalents	$ 12,605	$ 10,622
Loans receivable, net	269,023	262,574
Cash value of life insurance	8,713	9,328
Financial liabilities - Carrying Amount
Deposits	334,238	333,246
Long-term debt		10,000
Short-term debt	20,000	10,000
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	12,605
Loans receivable, net	275,819	260,223
Cash value of life insurance	8,713	9,328
Financial Liabilities Fair Value Disclosure [Abstract]
Deposits	324,512	315,418
Long-term debt		10,257
Short-term debt	20,739	$ 10,188
Fair Value | Level 1
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	12,605
Financial Liabilities Fair Value Disclosure [Abstract]
Deposits	227,585
Fair Value | Level 2
Assets, Fair Value Disclosure [Abstract]
Cash value of life insurance	8,713
Financial Liabilities Fair Value Disclosure [Abstract]
Deposits	96,927
Short-term debt	20,739
Fair Value | Level 3
Assets, Fair Value Disclosure [Abstract]
Loans receivable, net	$ 275,819