Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for loan losses	$ 84	$ 311
Accrued liabilities	218	222
State income taxes	46	51
Deferred compensation	494	475
Stock compensation	156	110
Net operating loss carryforward	5,886	6,141
Non-accrual loan interest	9	14
Partnership investment	175	125
General business credit	1,282	1,091
Alternative minimum tax credit	209	185
Other	37	531
Total deferred tax assets	8,596	9,256
Valuation allowance	0	(2,527)
Deferred tax liabilities:
Deferred loan fees/costs	(1,125)	(1,246)
Real estate owned		(15)
Basis difference on fixed assets	(57)	(59)
Net unrealized appreciation on available-for-sale securities	(90)	(164)
FHLB stock dividends	(371)	(574)
Mortgage servicing rights	(13)	(17)
Prepaid expenses	(33)	(60)
Total deferred tax liabilities	(1,689)	(2,135)
Net deferred tax assets	$ 6,907	$ 4,594