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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	$ 156,527
Held to Maturity, Due after one year through five years, Amortized Cost	783,310
Held to Maturity, Due after five years through ten years, Amortized Cost	210,771
Held to Maturity, Due after ten years, Amortized Cost	1,520,154
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	6,723
Held-to-maturity Securities, Equity Securities, Amortized cost	0
Held to Maturity, Amortized Cost	2,677,485	$ 2,926,486
Held to Maturity, Due in one year or less, Estimated Fair Value	159,683
Held to Maturity, Due after one year through five years, Estimated Fair Value	833,089
Held to Maturity, Due after five years through ten years, Estimated Fair Value	211,787
Held to Maturity, Due after ten years, Estimated Fair Value	1,506,243
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	6,806
Held-to-maturity Securities, Equity Securities, Fair Value	0
Held to Maturity, Estimated Fair Value	2,717,608	2,966,390
Available-for-sale Securities, Due in one year or less, Amortized Cost	279,202
Available for Sale, Due after one year through five years, Amortized Cost	3,146,728
Available for Sale, Due after five years through ten years, Amortized Cost	1,444,658
Available for Sale, Due after ten years, Amortized Cost	2,775,321
Available for Sale, Residential mortgage-backed securities, Amortized Cost	1,077,507
Available-for-sale Securities, Equity Securities, Amortized cost	42,437
Available for Sale, Amortized Cost	8,765,853	8,261,947
Available for Sale, Due in one year or less, Estimated Fair Value	281,771
Available for Sale, Due after one year through five years, Estimated Fair Value	3,196,000
Available for Sale, Due after five years through ten years, Estimated Fair Value	1,495,873
Available for Sale, Due after ten years, Estimated Fair Value	2,826,076
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	1,130,531
Available For Sale Securities Equity Securities Fair Value	42,437
Available for Sale, Estimated Fair Value	$ 8,972,688	$ 8,461,254

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