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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 24,390
Held to Maturity, Due after one year through five years, Amortized Cost	362,850
Held to Maturity, Due after five years through ten years, Amortized Cost	171,543
Held to Maturity, Due after ten years, Amortized Cost	2,597,647
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	10,262
Held to Maturity, Equity securities, Amortized Cost
Held to Maturity, Amortized Cost	3,166,692	2,956,381
Held to Maturity, Due in one year or less, Estimated Fair Value	24,863
Held to Maturity, Due after one year through five years, Estimated Fair Value	389,897
Held to Maturity, Due after five years through ten years, Estimated Fair Value	167,849
Held to Maturity, Due after ten years, Estimated Fair Value	2,477,469
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	10,271
Held to Maturity, Equity securities, Estimated Fair Value
Held to Maturity, Estimated Fair Value	3,070,349	2,996,944
Available for Sale, Due in one year or less, Amortized Cost	1,512,694
Available for Sale, Due after one year through five years, Amortized Cost	1,577,682
Available for Sale, Due after five years through ten years, Amortized Cost	517,090
Available for Sale, Due after ten years, Amortized Cost	277,368
Available For Sale, Residential mortgage-backed securities, Amortized Cost	1,995,296
Available for Sale, Equity securities, Amortized Cost	35,899
Available for Sale, Amortized Cost	5,916,029	5,990,577
Available for Sale, Due in one year or less, Estimated Fair Value	1,514,523
Available for Sale, Due after one year through five years, Estimated Fair Value	1,600,263
Available for Sale, Due after five years through ten years, Estimated Fair Value	516,034
Available for Sale, Due after ten years, Estimated Fair Value	291,078
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	2,075,573
Available for Sale, Equity securities, Estimated Fair Value	35,899
Available for Sale, Estimated Fair Value	$ 6,033,370	$ 6,203,299

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