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Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Securities transferred to available-for-sale |  | $ 3,171,117 | [1] | $ 104,281 |
Loans transferred to held for sale |  | 266,888 |  | 409,152 |
Fair Value, Measurements, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Certain impaired loans |  | 45,412 | [2] | 15,635 | [3]
Securities transferred to available-for-sale |  | 3,123,073 |  |  |
Loans transferred to held for sale |  | 1,536,836 |  |  |
Other assets | [4] | 1,546 |  | 5,684 |
Total |  | 4,706,867 |  | 21,319 |
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Securities transferred to available-for-sale |  | 199,992 |  |  |
Total |  | 199,992 |  |  |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Securities transferred to available-for-sale |  | 2,923,081 |  |  |
Total |  | 2,923,081 |  |  |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Certain impaired loans |  | 45,412 | [2] | 15,635 | [3]
Loans transferred to held for sale |  | 1,536,836 |  |  |
Other assets | [4] | 1,546 |  | 5,684 |
Total |  | $ 1,583,794 |  | $ 21,319 |
[1] | The amortized cost includes the non-credit portion of OTTI recorded in AOCL. At June 30, 2017, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).
[2] | Represents the fair value of impaired loans, based on the value of the collateral.
[3] | Represents the fair value of impaired loans, based on the value of the collateral, primarily taxi medallion loans .
[4] | Represents the fair value of OREO, based on the appraised value of the collateral subsequent to its initial classification as OREO.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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