Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Amortized cost and fair value of securities by contractual maturity
Securities Available for Sale, Due in one year or less, Amortized Cost	$ 292,434
Securities Available for Sale, Due after one year through five years, Amortized Cost	915,985
Securities Available for Sale, Due after five years through ten years, Amortized Cost	405,288
Securities Available for Sale, Due after ten years, Amortized Cost	2,783,430
Securities Available for Sale, Equity securities , Amortized Cost	4,208
Total available for sale securities, Amortized Cost	4,401,345	1,445,721
Securities Available for Sale, Due in one year or less, Fair Value	293,803
Securities Available for Sale, Due after one year through five years, Fair Value	934,279
Securities Available for Sale, Due after five years through ten years, Fair Value	421,935
Securities Available for Sale, Due after ten years, Fair Value	2,840,630
Securities Available for Sale, Equity securities, Fair Value	6,253
Total available for sale securities, Fair Value	$ 4,496,900	$ 1,488,885

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