 | us-gaap:IncomeStatementAbstract | domain-member | http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists |
 | us-gaap:GeneralAndAdministrativeExpenseAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternative |
 | us-gaap:GeneralAndAdministrativeExpenseAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternativeStatementTable |
 | us-gaap:GeneralAndAdministrativeExpenseAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITs |
 | us-gaap:GeneralAndAdministrativeExpenseAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITsStatementTable |
 | us-gaap:GeneralAndAdministrativeExpenseAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrusts |
 | us-gaap:GeneralAndAdministrativeExpenseAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrustsStatementTable |
 | us-gaap:GeneralAndAdministrativeExpenseAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:NoninterestExpense | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfIncomeFirstAlternative |
 | us-gaap:GeneralAndAdministrativeExpenseAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeStatementTable |
 | us-gaap:NoninterestExpenseAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenue |
 | us-gaap:NoninterestExpenseAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenueStatementTable |
 | us-gaap:GeneralAndAdministrativeExpenseAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenue |
 | us-gaap:GeneralAndAdministrativeExpenseAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenueStatementTable |
 | us-gaap:OperatingExpensesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncome |
 | us-gaap:OperatingExpensesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncomeStatementTable |
 | us-gaap:LaborAndRelatedExpenseAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/CompensationRelatedCostsGeneral |