Fair Value - Fair Value - Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financial Assets:
Securities available-for-sale	$ 12,029	$ 13,202
Carrying Value
Financial Assets:
Cash and cash equivalents	16,835	18,430
Securities available-for-sale	12,029	13,202
Loans receivable held for sale	39,037
Loans receivable held for investment	350,308	379,454
Accrued interest receivable	1,103	1,178
Federal Home Loan Bank stock	2,916	2,573
Financial Liabilities:
Deposits	273,847	287,427
Federal Home Loan Bank advances	104,000	85,000
Junior subordinated debentures	5,100	5,100
Accrued interest payable	105	154
Fair Value
Financial Assets:
Cash and cash equivalents	16,835	18,430
Securities available-for-sale	12,029	13,202
Loans receivable held for sale	39,597
Loans receivable held for investment	351,238	382,717
Accrued interest receivable	1,103	1,178
Federal Home Loan Bank stock	2,916	2,573
Financial Liabilities:
Deposits	264,619	278,254
Federal Home Loan Bank advances	104,418	85,748
Junior subordinated debentures	4,458	4,414
Accrued interest payable	105	154
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value
Financial Assets:
Cash and cash equivalents	16,835	18,430
Securities available-for-sale	1,989	1,988
Accrued interest receivable	57	64
Federal Home Loan Bank stock	2,916	2,573
Significant Other Observable Unobservable Inputs (Level 2) | Fair Value
Financial Assets:
Securities available-for-sale	10,040	11,214
Loans receivable held for sale	39,597
Accrued interest receivable	71	29
Financial Liabilities:
Deposits	264,619	278,254
Federal Home Loan Bank advances	104,418	85,748
Accrued interest payable	98	147
Significant Unobservable Inputs (Level 3) | Fair Value
Financial Assets:
Loans receivable held for investment	351,238	382,717
Accrued interest receivable	975	1,085
Financial Liabilities:
Junior subordinated debentures	4,458	4,414
Accrued interest payable	$ 7	$ 7