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Activity in the SBA servicing rights (Detail) (Commercial Loans [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Commercial Loans [Member]
   
Servicing Asset at Amortized Value, Balance [Roll Forward]    
Servicing Asset at Amortized Cost, Beginning Balance $ 440us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
$ 695us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Servicing Asset at Amortized Value, Amortization (180)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
(255)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Servicing Asset at Amortized Cost, Ending Balance 260us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
440us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Servicing Asset at Amortized Value, Fair Value $ 1,016us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
$ 1,609us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember