Annual report pursuant to Section 13 and 15(d)

Federal Home Loan Bank of Des Moines Advances Schedule of Underlying Assets of Federal Home Loan Bank Advances (Details)

v2.4.1.9
Federal Home Loan Bank of Des Moines Advances Schedule of Underlying Assets of Federal Home Loan Bank Advances (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 2,762,920us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 $ 0us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Available-for-sale Securities [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 2,284,532us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ two_SecuritiesorOtherAssetsUnderlyingFederalHomeLoanBankAdvancesAxis
= us-gaap_AvailableforsaleSecuritiesMember
0us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ two_SecuritiesorOtherAssetsUnderlyingFederalHomeLoanBankAdvancesAxis
= us-gaap_AvailableforsaleSecuritiesMember
Loans Held-for-sale, Mortgages [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 397,656us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ two_SecuritiesorOtherAssetsUnderlyingFederalHomeLoanBankAdvancesAxis
= two_LoansHeldForSaleMortgagesMember
0us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ two_SecuritiesorOtherAssetsUnderlyingFederalHomeLoanBankAdvancesAxis
= two_LoansHeldForSaleMortgagesMember
Retained Interest [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 80,732us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ two_SecuritiesorOtherAssetsUnderlyingFederalHomeLoanBankAdvancesAxis
= us-gaap_RetainedInterestMember