Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Amortized cost and fair value of available for sale securities by contractual maturity
Securities Available for Sale, Due in one year or less, Amortized Cost	$ 217,412
Securities Available for Sale, Due after one year through five years, Amortized Cost	61,956
Securities Available for Sale, Due after five years through ten years, Amortized Cost	290,851
Securities Available for Sale, Due after ten years, Amortized Cost	1,938,703
Securities Available for Sale, Equity securities , Amortized Cost	4,285
Total available for sale securities, Amortized Cost	2,513,207	4,401,345
Securities Available for Sale, Due in one year or less, Fair Value	218,057
Securities Available for Sale, Due after one year through five years, Fair Value	63,133
Securities Available for Sale, Due after five years through ten years, Fair Value	300,361
Securities Available for Sale, Due after ten years, Fair Value	1,991,617
Securities Available for Sale, Equity securities, Fair Value	5,363
Total available for sale securities, Fair Value	$ 2,578,531	$ 4,496,900

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