Income Taxes (Schedule of Deferred Tax Assets and Deferred Tax Liabilities) (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]
Asset
Allowance for possible losses on loans	$ 7,564	$ 8,081
Net unrealized losses and gains on available-for-sale securities	4,288	0
Pension and other benefits	3,900	3,715
Net unrealized losses on derivative instruments	1,369	3,879
Net unrealized losses on postretirement plans	992	1,476
Deferred compensation and benefits	963	904
Purchase accounting and deposit premium	321	0
Allowance for OTTI of investments	71	71
Allowance for OREO valuation	59	149
Other	695	706
Total	20,222	18,981
Liability
Net unrealized losses and gains on available-for-sale securities	0	6,969
Deposit premium	0	147
Depreciation	1,765	2,073
Deferred loan origination fees	1,390	1,256
Prepaid expenses	766	683
Mortgage servicing rights	254	190
Total	$ 4,175	$ 11,318
Income Tax Contingency [Line Items]
Open tax years			2010	2012