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Derivatives - Credit Value Adjustment Recorded Related to Notional Amount of Derivatives Outstanding (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Credit value adjustment | $ (272) | $ (3)
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 587,275 | 411,645
Not Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 87,188 | 36,111
Not Designated as Hedging Instrument [Member] | Interest Rate Collar [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 35,354 | 0
Not Designated as Hedging Instrument [Member] | Credit Default Swap, Buying Protection [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 164,632 | 162,139
Not Designated as Hedging Instrument [Member] | Credit Default Swap, Selling Protection [Member] |  |
Derivative [Line Items] |  |
Derivative, Sold Protection Notional Amount | (69,011) | (59,315)
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 25,460 | 9,900
Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Fair value adjustment | 801 | (133)
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 70,000 | 65,000
Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 30,000 | 15,000
Fair value adjustment | (63) | (170)
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 4,789 | 1,927
Fair value adjustment | $ (41) | $ (6)

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- Definition Derivative, Sold Protection Notional Amount + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of credit risk valuation adjustment to derivative liabilities to properly reflect the credit quality of the entity. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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Balance Type: | credit
Period Type: | duration

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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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- Details
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- Details
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- Details
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- Details
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