Income Taxes - Deferred Tax Asset (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets
Allowance for loan and lease losses	$ 8,371	$ 8,551
Net operating loss carryforward	4,851	7,682
Deferred compensation	1,780	1,608
Investment securities valuation	1,649
Forgone interest on non-accrual loans	1,498	1,472
Accruals	1,116	942
Deferred income	1,036	1,034
Alternative minimum tax credit	846	2,491
Fair value adjustment for acquired assets and liabilities	216	727
Deferred tax assets	21,363	24,507
Deferred tax liabilities
State deferred tax	1,234	1,656
Deferred costs, prepaids and FHLB advances	584	573
Premises and equipment	400	638
Investment securities valuation		368
Total deferred tax liabilities	2,218	3,235
Net deferred tax assets	19,145	$ 21,272
State tax
Deferred tax assets
Alternative minimum tax credit	$ 300