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SECURITIES AVAILABLE FOR SALE - Contractual Maturity Schedule (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Amortized Cost    
Within one year $ 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis  
One to five years 1,943us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis  
Five to ten years 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis  
Greater than ten years 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis  
SBA loan pool, private label residential mortgage-backed and agency mortgage-backed securities 387,494us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost  
Amortized Cost 389,437us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 344,878us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Fair Value    
Within one year 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue  
One to five years 2,001us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue  
Five to ten years 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue  
Greater than ten years 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue  
SBA loan pool, private label residential mortgage-backed and agency mortgage-backed securities 391,585us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue  
Total $ 393,586us-gaap_AvailableForSaleSecuritiesDebtSecurities $ 345,695us-gaap_AvailableForSaleSecuritiesDebtSecurities