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Securities (Amortized Cost and Estimated Fair Value of Securities Excluding Trading Securities Presented by Contractual Maturity) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 264,587 |
Held to Maturity, Due after one year through five years, Amortized Cost | 159,765 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 386,711 |
Held to Maturity, Due after ten years, Amortized Cost | 617,425 |
Held to Maturity, Residential mortgage-backed securities, Amortized Cost | 3,610 |
Held-to-maturity, Equity Securities, Amortized Cost | 0 |
Held to Maturity, Amortized Cost | 1,432,098 | $ 2,250,460
Held to Maturity, Due in one year or less, Estimated Fair Value | 267,924 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 163,819 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 391,784 |
Held to Maturity, Due after ten years, Estimated Fair Value | 628,677 |
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value | 3,587 |
Held-to-maturity, Equity Securities, Estimated Fair Value | 0 |
Held to Maturity, Estimated Fair Value | 1,455,791 | 2,262,747
Available for Sale, Due in one year or less, Amortized Cost | 57,390 |
Available for Sale, Due after one year through five years, Amortized Cost | 4,063,797 |
Available for Sale, Due after five years through ten years, Amortized Cost | 425,148 |
Available for Sale, Due after ten years, Amortized Cost | 5,092,767 |
Available For Sale, Residential mortgage-backed securities, Amortized Cost | 648,288 |
Available for Sale, Equity securities, Amortized Cost | 42,561 |
Available for Sale, Amortized Cost | 10,329,951 | 10,206,176
Available for Sale, Due in one year or less, Estimated Fair Value | 58,057 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 4,056,508 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 439,008 |
Available for Sale, Due after ten years, Estimated Fair Value | 5,227,789 |
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value | 665,086 |
Available for Sale, Equity securities, Estimated Fair Value | 42,561 |
Available for Sale, Estimated Fair Value | $ 10,489,009 | $ 10,203,277

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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=82897076&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=82897076&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=82897076&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 No definition available. + Details
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