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Summary of Significant Accounting Policies (Loans and Loans Held for Sale) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Number of business days to determine hold or sell loan 5 days  
Serviced unpaid principal amount $ 129.9ondk_ServicingAssetsandServicingLiabilitiesatFairValueAssumptionsUsedtoEstimateFairValueLoansPreviouslySoldUnpaidPrincipalBalance $ 79.7ondk_ServicingAssetsandServicingLiabilitiesatFairValueAssumptionsUsedtoEstimateFairValueLoansPreviouslySoldUnpaidPrincipalBalance
Unused lines of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet credit exposure related to undrawn line of credit 39.1us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember		 28.7us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember
Reserve for Off-balance Sheet Activities [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Related accrual for unfunded loan commitments $ 1.7us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ReserveForOffBalanceSheetActivitiesMember		 $ 1.3us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ReserveForOffBalanceSheetActivitiesMember