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Derivatives - Credit Value Adjustment Recorded Related to Notional Amount of Derivatives Outstanding (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Fair Value, Net | $ (1) | $ (791)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 402,840 | 401,304
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Fair Value, Net | (294) | 459
Derivative, Notional Amount | 65,000 | 150,000
Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 36,194 | 46,444
Credit Default Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 201,989 | 197,660
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 16,718 | 0
Forward Contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Fair Value, Net | (77) | 19
Derivative, Notional Amount | 19,000 | 17,000
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Fair Value, Net | 6 | (70)
Derivative, Notional Amount | 4,058 | 10,077
Short [Member] | Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 64,182 | $ 46,170

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + 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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