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Geographic Concentrations of Credit Risk Exceeding 5% of Total Loan Balances (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
NORTH CAROLINA  
Concentration Risk [Line Items]  
Principal Balance 516,150us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_StatementGeographicalAxis
= stpr_NC
NORTH CAROLINA | Credit Concentration Risk [Member]  
Concentration Risk [Line Items]  
Percentage Balance 37.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= stpr_NC
TEXAS  
Concentration Risk [Line Items]  
Principal Balance 339,014us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_StatementGeographicalAxis
= stpr_TX
TEXAS | Credit Concentration Risk [Member]  
Concentration Risk [Line Items]  
Percentage Balance 24.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX
OHIO  
Concentration Risk [Line Items]  
Principal Balance 197,455us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_StatementGeographicalAxis
= stpr_OH
OHIO | Credit Concentration Risk [Member]  
Concentration Risk [Line Items]  
Percentage Balance 14.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= stpr_OH
FLORIDA  
Concentration Risk [Line Items]  
Principal Balance 156,836us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_StatementGeographicalAxis
= stpr_FL
FLORIDA | Credit Concentration Risk [Member]  
Concentration Risk [Line Items]  
Percentage Balance 11.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL