Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net income	$ 14,025	$ 11,372	$ 8,761
Other Comprehensive Income [Abstract]
Unrealized gains (losses) on available-for-sale securities, net of taxes of $(1,256), $(3,206) and $855, for the years ended December 31, 2012, 2011 and 2010, respectively	1,966	5,020	(1,338)
Less: reclassification adjustment for realized gains included in net income net of taxes of $364, $189 and $212, for the years ended December 31, 2012, 2011 and 2010, respectively	(570)	(297)	(331)
Other-than-temporary impairment losses recognized in earnings net income taxes of $0, $(345), $(553), for the years ended December 31, 2012, 2011 and 2010, respectively	0	541	865
Unrealized losses on available-for-sale securities for which a portion of an other-than-temporary impairment has been recognized in income, net of taxes of $0, $31 and $1,103, for the years ended December 31, 2012, 2011 and 2010, respectively	0	50	1,726
Other comprehensive income, net of taxes	1,396	5,214	(2,530)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 15,421	$ 16,586	$ 6,231