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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, 2014 | Dec. 31, 2013
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Investments, Debt and Equity Securities [Abstract] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 168,070 |
Held to Maturity, Due after one year through five years, Amortized Cost | 463,083 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 155,173 |
Held to Maturity, Due after ten years, Amortized Cost | 2,270,211 |
Held to Maturity, Residential mortgage-backed securities, Amortized Cost | 9,330 |
Held to Maturity, Equity securities, Amortized Cost | 0 |
Held to Maturity, Amortized Cost | 3,065,867 | 3,139,748
Held to Maturity, Due in one year or less, Estimated Fair Value | 170,552 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 489,871 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 153,605 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,248,895 |
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value | 9,421 |
Held to Maturity, Equity securities, Estimated Fair Value | 0 |
Held to Maturity, Estimated Fair Value | 3,072,344 | 3,029,663
Available for Sale, Due in one year or less, Amortized Cost | 803,553 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,537,991 |
Available for Sale, Due after five years through ten years, Amortized Cost | 1,266,080 |
Available for Sale, Due after ten years, Amortized Cost | 995,435 |
Available For Sale, Residential mortgage-backed securities, Amortized Cost | 1,514,030 |
Available for Sale, Equity securities, Amortized Cost | 43,012 |
Available for Sale, Amortized Cost | 6,160,101 | 5,799,135
Available for Sale, Due in one year or less, Estimated Fair Value | 809,751 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,551,000 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 1,291,383 |
Available for Sale, Due after ten years, Estimated Fair Value | 1,037,236 |
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value | 1,590,561 |
Available for Sale, Equity securities, Estimated Fair Value | 43,012 |
Available for Sale, Estimated Fair Value | $ 6,322,943 | $ 5,895,436

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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 Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + 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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