Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets
Allowance for loan losses	$ 12,578	$ 12,144
Accrued employee benefits	3,826	3,763
Investments	2,884	2,447
Bank premises and equipment	349	1,060
Other	1,190	2,183
Gross deferred tax assets	20,827	21,597
Valuation allowance	1,341	605
Total deferred tax assets	19,486	20,992
Deferred Tax Liabilities
Purchase accounting adjustments	10,845	11,342
Deferred loan income	3,181	2,260
Available-for-sale securities	312	1,544
Other	1,305	664
Total deferred tax liabilities	15,643	15,810
Net deferred tax asset	3,843	$ 5,182
Partnership investment
Deferred Tax Assets
Gross deferred tax assets	$ 3,800