Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest on long term liabilities	$ (229)		$ (252)
Salaries and employee benefits	(1,910)		(1,974)
Net gains on sales and redemptions of investment securities	39		112
Provision for income taxes	(187)		(176)
Net income	505		529
Amount Reclassified from AOCI [Member] | Unrealized Holding Gain on Financial Derivative [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest on long term liabilities	(15)	[1]
Provision for income taxes	6	[1]
Net income	(9)	[1]
Amount Reclassified from AOCI [Member] | Retirement Plan Items [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	(95)	[1],[2]
Provision for income taxes	38	[1]
Net income	(57)	[1]
Amount Reclassified from AOCI [Member] | Available-for-Sale Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net gains on sales and redemptions of investment securities	39	[1]
Provision for income taxes	(16)	[1]
Net income	$ 23	[1]

[1] Amounts in parentheses indicates debits in net income

[2] These items are included in net periodic pension cost. See Note 5 for additional information