Income Tax Expense (Schedule of Gross Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowance for loan losses	$ 10,015	$ 10,116
Defined benefit pension obligations	3,447	6,719
Deferred compensation	3,181	2,761
Deferred loan origination fees	2,001	1,822
Stock based compensation	1,772	1,676
Other	3,547	3,026
Deferred tax assets	23,963	26,120
Deferred tax liabilities:
Net unrealized gains on securities available for sale	(617)	(2,373)
Amortization of intangibles	(4,240)	(1,750)
Deferred loan origination costs	(5,089)	(4,694)
Loan servicing rights	(1,238)	(1,078)
Other	(1,009)	(1,206)
Deferred tax liabilities	(12,193)	(11,101)
Net deferred tax asset	$ 11,770	$ 15,019