 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-RealEstateOperations |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-RealEstateOperationsStatementTable |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionClassified-RealEstateOperations |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionClassified-RealEstateOperationsStatementTable |
 | us-gaap:IncreaseDecreaseInStockholdersEquityRollForward | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfShareholdersEquityAndOtherComprehensiveIncome |
 | us-gaap:IncreaseDecreaseInStockholdersEquityRollForward | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfShareholdersEquityAndOtherComprehensiveIncome |
 | us-gaap:IncreaseDecreaseInStockholdersEquityRollForward | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfShareholdersEquityAndOtherComprehensiveIncomeStatementTable |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionClassified |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionClassifiedStatementTable |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-DepositBasedOperations |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-DepositBasedOperationsStatementTable |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-InvestmentBasedOperations |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-InvestmentBasedOperationsStatementTable |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-SecuritiesBasedOperations |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-SecuritiesBasedOperationsStatementTable |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/Equity |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | domain-member | http://fasb.org/us-gaap/role/disclosure/EquityScheduleOfStockByClassTable |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/RegulatedOperations |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | domain-member | http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsScheduleOfCapitalizationEquityTable |
 | us-gaap:CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract | domain-member | http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsScheduleOfCapitalizationTable |
 | us-gaap:NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems | parent-child | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInsuranceA |
 | us-gaap:NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInsuranceANewAccountingPronouncementsOrChangeInAccountingPrincipleTable |