Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Statement of Income and Comprehensive Income [Abstract]
Net Income	$ 12,321	$ 7,419	$ 23,372	$ 12,665
Other comprehensive (loss) income, before tax (benefit) expense:
Unrealized holding gains on securities arising during the period	998	9,125	1,097	7,509
Non-credit related (losses) gains on securities not expected to be sold	(1,323)	448	175	2,317
Less: reclassification adjustment for losses on securities included in net income	0	(1,608)	0	(2,185)
Total other comprehensive (loss) income, before tax (benefit) expense	(325)	7,965	1,272	7,641
Income tax (benefit) expense related to items of other comprehensive (loss) income	(119)	2,787	439	2,674
Comprehensive Income	$ 12,115	$ 12,597	$ 24,205	$ 17,632