Securities (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Amortized cost and fair value of held to maturity securities by contractual maturity
Securities Held to Maturity, Due in one year or less, Amortized Cost	$ 16,838
Securities Held to Maturity, Due after one year through five years, Amortized Cost	187,112
Securities Held to Maturity, Due after five years through ten years, Amortized Cost	100,147
Securities Held to Maturity, Due after ten years, Amortized Cost	1,511,217
Total Held to Maturity securities, Amortized Cost	1,815,314
Securities Held to Maturity, Due in one year or less, Fair Value	16,940
Securities Held to Maturity, Due after one year through five years, Fair Value	191,205
Securities Held to Maturity, Due after five years through ten years, Fair Value	108,840
Securities Held to Maturity, Due after ten years, Fair Value	1,497,618
Total Held to Maturity Securities, Fair Value	$ 1,814,603

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