Fair Value - Fair Value - Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financial Assets:
Securities available-for-sale	$ 11,474	$ 13,202
Carrying Value
Financial Assets:
Cash and cash equivalents	68,345	18,430
Securities available-for-sale	11,474	13,202
Loans receivable held for sale	22,521
Loans receivable held for investment	320,522	379,454
Accrued interest receivable	1,113	1,178
Federal Home Loan Bank stock	2,916	2,573
Financial Liabilities:
Deposits	294,920	287,427
Federal Home Loan Bank advances	86,000	85,000
Junior subordinated debentures	5,100	5,100
Accrued interest payable	283	154
Fair Value
Financial Assets:
Cash and cash equivalents	68,345	18,430
Securities available-for-sale	11,474	13,202
Loans receivable held for sale	22,910
Loans receivable held for investment	319,012	382,717
Accrued interest receivable	1,113	1,178
Federal Home Loan Bank stock	2,916	2,573
Financial Liabilities:
Deposits	286,024	278,254
Federal Home Loan Bank advances	86,268	85,748
Junior subordinated debentures	4,481	4,414
Accrued interest payable	283	154
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value
Financial Assets:
Cash and cash equivalents	68,345	18,430
Securities available-for-sale	1,989	1,988
Accrued interest receivable	63	64
Federal Home Loan Bank stock	2,916	2,573
Significant Other Observable Inputs (Level 2) | Fair Value
Financial Assets:
Securities available-for-sale	9,485	11,214
Loans receivable held for sale	22,910
Accrued interest receivable	89	29
Financial Liabilities:
Deposits	286,025	278,254
Federal Home Loan Bank advances	86,238	85,748
Accrued interest payable	277	147
Significant Unobservable Inputs (Level 3) | Fair Value
Financial Assets:
Loans receivable held for investment	319,012	382,717
Accrued interest receivable	961	1,085
Financial Liabilities:
Junior subordinated debentures	4,481	4,414
Accrued interest payable	$ 6	$ 7