Income Taxes - Components of deferred income taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowance for credit losses	$ 3,823	$ 3,188
Deferred compensation	5,038	4,979
Net operating loss carryover from acquisition	75	698
Bank premises and equipment	351	186
Mark-to-market adjustment	96	98
Other deferred taxes	313	511
Other than temporary impairment	267	267
Loan and investment impairment	721	887
State Enterprise Zone credit carry-forward	1,067	1,444
State capital loss carry-forward	0	20
Alternative minimum tax credit	3,525	3,338
State taxes	266	1
Partnership income	87	70
Total deferred tax assets	15,629	15,687
Valuation allowance	0	(20)
Net deferred tax asset after valuation allowance	15,629	15,667
Deferred tax liabilities:
Finance leases	(921)	(1,871)
Unrealized gain on available-for-sale investment securities	(3,076)	(3,661)
Core deposit intangible	(421)	(553)
FHLB stock	(319)	(319)
Loan origination costs	(664)	(553)
Total deferred tax liabilities	(5,401)	(6,957)
Net deferred tax assets	$ 10,228	$ 8,710