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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	Mar. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 136,041
Held to Maturity, Due after one year through five years, Amortized Cost	451,340
Held to Maturity, Due after five years through ten years, Amortized Cost	167,188
Held to Maturity, Due after ten years, Amortized Cost	2,318,001
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	9,512
Held to Maturity, Equity securities, Amortized Cost	0
Held to Maturity, Amortized Cost	3,082,082	3,139,748
Held to Maturity, Due in one year or less, Estimated Fair Value	140,005
Held to Maturity, Due after one year through five years, Estimated Fair Value	478,859
Held to Maturity, Due after five years through ten years, Estimated Fair Value	163,840
Held to Maturity, Due after ten years, Estimated Fair Value	2,253,209
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	9,546
Held to Maturity, Equity securities, Estimated Fair Value	0
Held to Maturity, Estimated Fair Value	3,045,459	3,029,663
Available for Sale, Due in one year or less, Amortized Cost	798,320
Available for Sale, Due after one year through five years, Amortized Cost	880,127
Available for Sale, Due after five years through ten years, Amortized Cost	1,298,721
Available for Sale, Due after ten years, Amortized Cost	741,175
Available For Sale, Residential mortgage-backed securities, Amortized Cost	1,610,400
Available for Sale, Equity securities, Amortized Cost	35,990
Available for Sale, Amortized Cost	5,364,733	5,799,135
Available for Sale, Due in one year or less, Estimated Fair Value	806,678
Available for Sale, Due after one year through five years, Estimated Fair Value	889,983
Available for Sale, Due after five years through ten years, Estimated Fair Value	1,305,841
Available for Sale, Due after ten years, Estimated Fair Value	766,056
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	1,677,917
Available for Sale, Equity securities, Estimated Fair Value	35,990
Available for Sale, Estimated Fair Value	$ 5,482,465	$ 5,895,436

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