Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net unrealized holding gain from available for sale securities arising during the period, tax	$ (1,902)	$ 7,462	$ 1,047
Reclassification adjustment of net gain from sale of available for sale securities included in income, tax	1,316	48	20
Reclassification adjustment of net gain included in income, tax	0	79	625
Net unrealized gain from unfunded defined benefit plan liability arising during the period, tax	0	154	(12)
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost, tax	$ (38)	$ (31)	$ (15)