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Derivatives - Credit Value Adjustment Recorded Related to Notional Amount of Derivatives Outstanding (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Fair Value, Net | $ (498)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ (268)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Fair Value, Net | 1,667 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 472 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivative, Notional Amount | 200,000 invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 100,000 invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 286,528 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 273,388 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 6,375 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateCapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 6,656 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateCapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Credit Default Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 109,114 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 113,624 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ (17,827)invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapSellingProtectionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ (17,296)invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapSellingProtectionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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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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Balance Type: | na
Period Type: | instant

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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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 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 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 4: 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 + Details
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- Details
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- Details
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- Details
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