Income Taxes (Tax Effects of Temporary Differences and Tax Credits that Give Rise to Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Deferred tax assets: Allowance for loan losses	$ 4,309	$ 3,974
Deferred tax assets: Post retirement benefit obligation	1,685	1,444
Deferred tax assets: Loan mark-to-market adjustment	2,778	2,627
Deferred tax assets: Deferred compensation	1,293	1,217
Deferred tax assets: Installment sales	180	293
Deferred tax assets: Core deposit intangible	70	108
Deferred tax assets: Interest rate swap	370	492
Deferred tax assets: Other	647	335
Deferred tax assets: Investment in real estate limited partnerships, net	246	86
Total deferred tax assets	11,578	10,576
Deferred tax liabilities: Unrealized gain on securities available for sale	(3,259)	(3,598)
Deferred tax liabilities: Depreciation	(1,638)	(1,746)
Deferred tax liabilities: Accrued pension cost	(2,949)	(1,288)
Total deferred tax liabilities	(7,846)	(6,632)
Net deferred tax assets	$ 3,732	$ 3,944