Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 36,732	$ 14,960	$ 97,998	$ 35,776
Other comprehensive income
Change in unrealized gain on securities available for sale	20,906	11,863	27,230	41,887
Tax effect and reclassification adjustment	(7,570)	(911)	(9,827)	(965)
Unrealized holding gains (losses) arising during period	13,336	10,952	17,403	40,922
Non-credit related unrealized loss on other-than-temporarily impaired debt securities	136	(679)	2,250	(2,200)
Tax effect	(50)	249	(825)	807
Reclassification adjustment for gains (losses) included in net income	86	(430)	1,425	(1,393)
Change in unrealized loss on cash flow hedges	(2,614)	(16,842)	(6,389)	(24,130)
Tax effect	955	6,331	2,250	8,844
Change in unrealized loss on cash flow hedges, net of tax	(1,659)	(10,511)	(4,139)	(15,286)
Adjustment to postretirement benefit obligations	0	0	0	(463)
Tax effect	0	0	0	162
Adjustment to postretirement benefit obligations, net of tax	0	0	0	(301)
Total other comprehensive income	11,763	11	14,689	23,942
Total comprehensive income	$ 48,495	$ 14,971	$ 112,687	$ 59,718