Securities - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Investments Debt And Equity Securities [Abstract]
Securities Available for Sale, Due in one year or less, Amortized Cost	$ 28,214
Securities Available for Sale, Due after one year through five years, Amortized Cost	262,761
Securities Available for Sale, Due after five years through ten years, Amortized Cost	227,797
Securities Available for Sale, Due after ten years, Amortized Cost	2,281,068
Total available for sale securities, Amortized Cost	2,799,840
Securities Available for Sale, Due in one year or less, Fair Value	28,355
Securities Available for Sale, Due after one year through five years, Fair Value	264,703
Securities Available for Sale, Due after five years through ten years, Fair Value	237,802
Securities Available for Sale, Due after ten years, Fair Value	2,317,308
Total available for sale securities, Fair Value	$ 2,848,168

Available for sale securities fair value.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing after the tenth fiscal year following the latest fiscal year.

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