Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Investment [Line Items]
Due in one year or less, Weighted Average Yield	1.94%
Due after one year through five years, Weighted Average Yield	2.48%
Due after five years through ten years, Weighted Average Yield	2.72%
Due after ten years, Weighted Average Yield	4.03%
Total available for sale Securities Debt Maturities, Weighted Average Yield	2.47%
Due in one year or less, Fair Value	$ 277,657
Due after one year through five years, Fair Value	1,716,879
Due after five years through ten years, Fair Value	425,119
Due after ten years, Fair Value	29,732
Available-for-sale Securities, Debt Maturities fair value	2,449,387
Due in one year or less, Amortized Cost	276,581
Due after one year through five years, Amortized Cost	1,660,947
Due after five years through ten years, Amortized Cost	409,264
Due after ten years, Amortized Cost	28,024
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	$ 2,374,816

Total available for sale securities debt maturities weighted average yield.

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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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