Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 12,149	$ 2,738	$ 6,932
Other comprehensive income (loss):
Unrealized holding gain (loss) on available for sale securities arising during the period on securities held at end of period, net of tax of $543, $3,677, and $(377), respectively	1,009	6,829	(701)
Reclassification adjustment for prior period unrealized gain previously reported in other comprehensive income recognized during current period, net of tax of $330, $84, and $1,863, respectively	(612)	(156)	(3,459)
Change in unfunded portion of postretirement benefit obligations, net of tax of $(92), $(500), and $643, respectively	(171)	(928)	1,194
Other comprehensive income (loss)	226	5,745	(2,966)
Comprehensive income	$ 12,375	$ 8,483	$ 3,966