Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	$ (3,215)		$ (1,102)	$ (1,318)		$ (2,664)
Other comprehensive income (loss) before reclassifications	40		553	(1,930)		2,050
Amounts reclassified from AOCI	56		44	129		109
Ending balance	(3,119)		(505)	(3,119)		(505)
Interest on long term liabilities	(151)		(243)	(575)		(750)
Salaries and employee benefits	(2,033)		(1,733)	(5,884)		(5,576)
Net gains on sales and redemptions of investment securities	17		18	116		179
Provision for income taxes	(195)		(223)	(688)		(641)
Net income	528		670	1,856		1,919
Unrealized Holding Gain on Financial Derivative [Member]
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(91)		(124)	(117)		(120)
Other comprehensive income (loss) before reclassifications	(5)		(10)	2		(32)
Amounts reclassified from AOCI	9		8	28		26
Ending balance	(87)		(126)	(87)		(126)
Retirement Plans Items [Member]
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(2,651)		(2,322)	(2,765)		(3,617)
Other comprehensive income (loss) before reclassifications	0		0	0		1,151
Amounts reclassified from AOCI	57		47	171		191
Ending balance	(2,594)		(2,275)	(2,594)		(2,275)
Unrealized Loss on Securities Transferred to Held-to-Maturity [Member]
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	0		0	0		0
Other comprehensive income (loss) before reclassifications	(799)		0	(799)		0
Amounts reclassified from AOCI	0		0	0		0
Ending balance	(799)		0	(799)		0
Unrealized Gains and Losses on Available-for-Sale Securities
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(473)		1,344	1,564		1,073
Other comprehensive income (loss) before reclassifications	844		563	(1,133)		931
Amounts reclassified from AOCI	(10)		(11)	(70)		(108)
Ending balance	361		1,896	361		1,896
Amount Reclassified from AOCI [Member] | Unrealized Holding Gain on Financial Derivative [Member]
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Interest on long term liabilities	(15)	[1]		(46)	[1]
Provision for income taxes	6	[1]		18	[1]
Net income	(9)	[1]		(28)	[1]
Amount Reclassified from AOCI [Member] | Retirement Plans Items [Member]
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Salaries and employee benefits	(95)	[1],[2]		(286)	[1],[2]
Provision for income taxes	38	[1],[2]		115	[1],[2]
Net income	(57)	[1],[2]		(171)	[1],[2]
Amount Reclassified from AOCI [Member] | Unrealized Gains and Losses on Available-for-Sale Securities
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net gains on sales and redemptions of investment securities	(17)	[1]		(116)	[1]
Provision for income taxes	7	[1]		46	[1]
Net income	$ (10)	[1]		$ (70)	[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.