Summary of Contractual Maturity Information for Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]
Due in 1 year or less, Amortized Cost	$ 569,017
Due after 1 year through 5 years, Amortized Cost	2,020,200
Due after 5 years through 10 years, Amortized Cost	753,872
Due after 10 years, Amortized Cost	178,100
Total, Amortized Cost	3,521,189
Mortgage-backed securities, Amortized Cost	3,218,547
Total securities available for sale, Amortized Cost	6,739,736	6,802,656
Due in 1 year or less, Fair Value	571,721
Due after 1 year through 5 years, Fair Value	2,048,453
Due after 5 years through 10 years, Fair Value	773,932
Due after 10 years, Fair Value	176,760
Total, Fair Value	3,570,866
Mortgage-backed securities, Fair Value	3,270,718
Total securities available for sale, Fair Value	$ 6,841,584	$ 6,937,463

Mortgage-backed securities available-for-sale, amortized cost.

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