Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net Income	$ 10,553	$ 11,051
Other comprehensive (loss) income, before tax expense:
Unrealized holding (losses) gains on securities arising during the period	(4,275)	99
Non-credit related gains on securities not expected to be sold	1,864	1,498
Less: reclassification adjustment for gains on securities included in net income	(4)	0
Total other comprehensive (loss) income, before tax expense	(2,415)	1,597
Income tax benefit (expense) related to items of other comprehensive income	844	(558)
Total other comprehensive income	(1,571)	1,039
Comprehensive Income	$ 8,982	$ 12,090