 | us-gaap:DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLossAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-RealEstateOperations |
 | us-gaap:DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLossAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-RealEstateOperationsStatementTable |
 | us-gaap:DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLossAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-DepositBasedOperations |
 | us-gaap:Investments | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-DepositBasedOperations |
 | us-gaap:DebtSecurities | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-DepositBasedOperationsFirstAlternate |
 | us-gaap:DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLossAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-DepositBasedOperationsStatementTable |
 | us-gaap:DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLossAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-InvestmentBasedOperations |
 | us-gaap:DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLossAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfFinancialPositionUnclassified-InvestmentBasedOperationsStatementTable |
 | us-gaap:DebtSecuritiesAvailableForSaleAndHeldToMaturityAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/InvestmentsDebtAndEquitySecurities |
 | us-gaap:DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLossAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/InvestmentsDebtAndEquitySecurities |
 | us-gaap:HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/InvestmentsDebtAndEquitySecurities |
 | us-gaap:HeldtomaturitySecuritiesDebtMaturitiesAmortizedCostRollingMaturityAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/InvestmentsDebtAndEquitySecurities |
 | us-gaap:DebtSecuritiesAvailableForSaleAndHeldToMaturity | summation-item | http://fasb.org/us-gaap/role/disclosure/InvestmentsDebtAndEquitySecuritiesCalcAlt1 |
 | us-gaap:DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLossAbstract | domain-member | http://fasb.org/us-gaap/role/disclosure/InvestmentsDebtAndEquitySecuritiesScheduleOfHeldToMaturitySecuritiesTable |
 | us-gaap:DebtSecuritiesAvailableForSaleAndHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss | summation-item | http://fasb.org/us-gaap/role/disclosure/CreditLossesCalc2 |