Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Unrealized loss on securities, tax benefit	$ 209	$ 3,900	$ 286	$ 3,361
Accretion of unrealized loss on securities reclassified to held-to-maturity, tax expense	125		233
Reclassification adjustment for gains included in net income, Tax expense	$ 142	$ 17	$ 142	$ 17