Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income [Abstract]
Unrealized gains on available-for-sale securities, taxes	$ 7,362	$ (1,256)	$ (3,206)
Other Comprehensive Income Loss Reclassification Adjustment For Sale Or Writedown Of Securities Included In Net Income Tax	894	364	189
Other Than Temporary Impairment Losses recognized in earnings, tax	0	0	(345)
Unrealized gains (losses) on available-for-sale securities for which a portion of an other-than-temporary impairment has been recognized in income, taxes	$ 0	$ 0	$ (31)