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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, 2016 | Dec. 31, 2015
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Investments, Debt and Equity Securities [Abstract] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 687,531 |
Held to Maturity, Due after one year through five years, Amortized Cost | 279,353 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 323,435 |
Held to Maturity, Due after ten years, Amortized Cost | 969,508 |
Held to Maturity, Residential mortgage-backed securities, Amortized Cost | 4,633 |
Held-to-maturity Securities, Equity Securities, Amortized cost | 0 |
Held to Maturity, Amortized Cost | 2,264,460 | $ 2,663,009
Held to Maturity, Due in one year or less, Estimated Fair Value | 700,574 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 296,816 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 333,322 |
Held to Maturity, Due after ten years, Estimated Fair Value | 991,017 |
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value | 4,701 |
Held-to-maturity Securities, Equity Securities, Fair Value | 0 |
Held to Maturity, Estimated Fair Value | 2,326,430 | 2,710,685
Available-for-sale Securities, Due in one year or less, Amortized Cost | 82,116 |
Available for Sale, Due after one year through five years, Amortized Cost | 4,109,251 |
Available for Sale, Due after five years through ten years, Amortized Cost | 848,652 |
Available for Sale, Due after ten years, Amortized Cost | 3,910,959 |
Available for Sale, Residential mortgage-backed securities, Amortized Cost | 805,227 |
Available-for-sale Securities, Equity Securities, Amortized cost | 42,484 |
Available for Sale, Amortized Cost | 9,798,689 | 9,019,570
Available for Sale, Due in one year or less, Estimated Fair Value | 83,878 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 4,204,075 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 899,310 |
Available for Sale, Due after ten years, Estimated Fair Value | 4,083,536 |
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value | 849,543 |
Available For Sale Securities Equity Securities Fair Value | 42,484 |
Available for Sale, Estimated Fair Value | $ 10,162,826 | $ 9,206,358

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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=65884222&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=73527792&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=66010992&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 Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, over several maturity groupings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d),(f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: 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=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + 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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