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Derivatives - Credit Value Adjustment Recorded Related to Notional Amount of Derivatives Outstanding (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Fair Value, Net | $ (2) | $ (791)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | (408,973) | (401,304)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Fair Value, Net | (590) | 459
Derivative, Notional Amount | (115,000) | (150,000)
Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | (46,361) | (46,444)
Credit Default Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | (189,491) | (197,660)
Forward Contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Fair Value, Net | 81 | 19
Derivative, Notional Amount | (22,000) | (17,000)
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Fair Value, Net | (13) | (70)
Derivative, Notional Amount | (7,858) | (10,077)
Short [Member] | Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ (63,345) | $ (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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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