Fair Value - Fair Value - Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial Assets:
Securities available-for-sale, at fair value	$ 13,202	$ 14,140
Carrying Value
Financial Assets:
Cash and cash equivalents	18,430	67,839
Securities available-for-sale, at fair value	13,202	14,140
Loans receivable held for investment	379,454	304,171
Accrued interest receivable	1,178	1,077
Federal Home Loan Bank stock	2,573	2,573
Financial Liabilities:
Deposits	287,427	272,614
Federal Home Loan Bank advances	85,000	72,000
Junior subordinated debentures	5,100	5,100
Accrued interest payable	154	52
Fair Value
Financial Assets:
Cash and cash equivalents	18,430	67,839
Securities available-for-sale, at fair value	13,202	14,140
Loans receivable held for investment	382,717	306,643
Accrued interest receivable	1,178	1,077
Federal Home Loan Bank stock	2,573	2,573
Financial Liabilities:
Deposits	278,254	265,495
Federal Home Loan Bank advances	85,748	73,441
Junior subordinated debentures	4,414	3,117
Accrued interest payable	154	52
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value
Financial Assets:
Cash and cash equivalents	18,430	67,839
Securities available-for-sale, at fair value	1,988	1,973
Accrued interest receivable	64	63
Federal Home Loan Bank stock	2,573	2,573
Significant Other Observable Unobservable Inputs (Level 2) | Fair Value
Financial Assets:
Securities available-for-sale, at fair value	11,214	12,167
Accrued interest receivable	29	31
Financial Liabilities:
Deposits	278,254	265,495
Federal Home Loan Bank advances	85,748	73,441
Accrued interest payable	147	46
Significant Unobservable Inputs (Level 3) | Fair Value
Financial Assets:
Loans receivable held for investment	382,717	306,643
Accrued interest receivable	1,085	983
Financial Liabilities:
Junior subordinated debentures	4,414	3,117
Accrued interest payable	$ 7	$ 6