Securities - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Securities Available for Sale, Due in one year or less, Amortized Cost	$ 53,882
Securities Available for Sale, Due after one year through five years, Amortized Cost	195,876
Securities Available for Sale, Due after five years through ten years, Amortized Cost	338,242
Securities Available for Sale, Due after ten years, Amortized Cost	1,535,484
Total available for sale securities, Amortized Cost	2,123,484
Securities Available for Sale, Due in one year or less, Fair Value	54,121
Securities Available for Sale, Due after one year through five years, Fair Value	197,715
Securities Available for Sale, Due after five years through ten years, Fair Value	351,122
Securities Available for Sale, Due after ten years, Fair Value	1,600,548
Total available for sale securities, Fair Value	$ 2,203,506

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

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