Summary of Contractual Maturity Information for Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Due in 1 year or less, Amortized Cost	$ 503,011
Due after 1 year through 5 years, Amortized Cost	1,679,302
Due after 5 years through 10 years, Amortized Cost	677,475
Due after 10 years, Amortized Cost	122,144
Total, Amortized Cost	2,981,932
Mortgage-backed securities, Amortized Cost	3,344,828
Total securities available for sale, Amortized Cost	6,326,760
Due in 1 year or less, Fair Value	505,373
Due after 1 year through 5 years, Fair Value	1,714,184
Due after 5 years through 10 years, Fair Value	705,935
Due after 10 years, Fair Value	125,009
Total, Fair Value	3,050,501
Mortgage-backed securities, Fair Value	3,436,623
Total securities available for sale, Fair Value	$ 6,487,124	$ 6,107,882

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

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