Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Consolidated Statements of Comprehensive Income
Net unrealized holding (losses) gains on securities available for sale arising during period, tax effects	$ (35,282)	$ 4,354	$ (40,425)	$ 395
Reclassification adjustment for gains on securities available for sale included in net income, tax effects	0	(497)	(3,360)	(907)
Reclassification adjustment for impairment charges on available for sale securities included in net income, tax effects	$ 146	$ 78	$ 254	$ 143