Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Accumulated other comprehensive (loss) income, Beginning Balance	$ 132,894	$ (18,946)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(7,163)	144,677
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(42,404)	(42,404)
Net current period OCI	(49,567)	102,273
Accumulated other comprehensive (loss) income, Ending Balance	83,327	83,327
Unrealized gain (loss) on securities available for sale [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	188,570	19,432
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(8,252)	160,886
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(42,404)	(42,404)
Net current period OCI	(50,656)	118,482
Accumulated other comprehensive (loss) income, Ending Balance	137,914	137,914
Pro-rata share of non consolidated subsidiaries' OCI [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	(12,041)	11,313
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(1,669)	(25,023)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Net current period OCI	(1,669)	(25,023)
Accumulated other comprehensive (loss) income, Ending Balance	(13,710)	(13,710)
Change in value of interest rate Swap [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	(35,505)	(50,065)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(295)	14,265
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Net current period OCI	(295)	14,265
Accumulated other comprehensive (loss) income, Ending Balance	(35,800)	(35,800)
Other [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	(8,130)	374
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	3,053	(5,451)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Net current period OCI	3,053	(5,451)
Accumulated other comprehensive (loss) income, Ending Balance	$ (5,077)	$ (5,077)