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Derivatives - Summary of Gain (Loss) on Change in Fair Value of Derivatives Included in Condensed Consolidated Statements of Operations (Detail) - Derivatives Not Designed as Hedging Instruments [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) recognized in income for derivatives | $ 7,035 | $ 2,642
Interest Rate Contract [Member] | Rate Lock Commitments [Member] | Gains from Mortgage Banking Activities/Orginations, Net [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) recognized in income for derivatives | 2,269 | 132
Interest Rate Contract [Member] | Rate Lock Commitments [Member] | Compensation and Employee Benefits [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) recognized in income for derivatives | (2,500) | (807)
Forward Sale Contracts [Member] | Deliver Loans to Third-party Investors [Member] | Gains from Mortgage Banking Activities/Orginations, Net [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) recognized in income for derivatives | $ 7,266 | $ 3,317

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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