Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Income	$ 5,207	$ 5,594	$ 10,388	$ 10,882
Other comprehensive income (loss), before reclassifications, net of tax	(3,643)	445	(3,423)	347
Reclassification from Accumulated Other Comprehensive Income, current period, net of tax	228	138	146	59
Other Comprehensive Income (Loss)	(3,415)	583	(3,277)	406
Comprehensive Income	1,792	6,177	7,111	11,288
Unrealized Gains and Losses on Available for Sale Securities [Member]
Other comprehensive income (loss), before reclassifications, net of tax	(3,643)	445	(3,423)	347
Reclassification from Accumulated Other Comprehensive Income, current period, net of tax	(8)	(86)	(326)	(389)
Amortization of Net Retirement Plan Actuarial Loss [Member]
Other comprehensive income (loss), before reclassifications, net of tax	0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, current period, net of tax	236	229	472	457
Accretion of Net Retirement Plan Prior Service Credit [Member]
Other comprehensive income (loss), before reclassifications, net of tax	0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, current period, net of tax	$ 0	$ (5)	$ 0	$ (9)