Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Comprehensive Income [Abstract]
Unrealized gains on available-for-sale securities, taxes	$ (1,005)	$ (5,590)	$ 7,362
Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity, Tax	518	0	0
Other Comprehensive Income Loss Reclassification Adjustment For Sale Or Writedown Of Securities Included In Net Income Tax	176	279	894
Other Than Temporary Impairment Losses recognized in earnings, tax	0	0	0
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	$ 0