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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 | Sep. 30, 2013 | Dec. 31, 2012
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Investments, Debt and Equity Securities [Abstract] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 30,674 |
Held to Maturity, Due after one year through five years, Amortized Cost | 381,844 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 178,783 |
Held to Maturity, Due after ten years, Amortized Cost | 2,554,977 |
Held to Maturity, Residential mortgage-backed securities, Amortized Cost | 9,868 |
Held to Maturity, Equity securities, Amortized Cost | 0 |
Held to Maturity, Amortized Cost | 3,156,146 | 2,956,381
Held to Maturity, Due in one year or less, Estimated Fair Value | 31,223 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 409,840 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 175,708 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,426,229 |
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value | 9,912 |
Held to Maturity, Equity securities, Estimated Fair Value | 0 |
Held to Maturity, Estimated Fair Value | 3,052,912 | 2,996,944
Available for Sale, Due in one year or less, Amortized Cost | 1,014,141 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,573,827 |
Available for Sale, Due after five years through ten years, Amortized Cost | 669,101 |
Available for Sale, Due after ten years, Amortized Cost | 331,509 |
Available For Sale, Residential mortgage-backed securities, Amortized Cost | 1,828,500 |
Available for Sale, Equity securities, Amortized Cost | 35,908 |
Available for Sale, Amortized Cost | 5,452,986 | 5,990,577
Available for Sale, Due in one year or less, Estimated Fair Value | 1,015,777 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,597,207 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 670,434 |
Available for Sale, Due after ten years, Estimated Fair Value | 344,655 |
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value | 1,905,810 |
Available for Sale, Equity securities, Estimated Fair Value | 35,908 |
Available for Sale, Estimated Fair Value | $ 5,569,791 | $ 6,203,299

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Mortgage-Backed Securities -URI http://asc.fasb.org/extlink&oid=6517959 + Details
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