| Name | SuppliesAndPostageExpense |
|---|---|
| Namespace | http://fasb.org/us-gaap/2021-01-31 |
| Prefix | us-gaap |
| Data type | xbrli:monetaryItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | debit |
| Nillable | True |
| Abstract | False |
| Text | Lang | Role | Container role |
|---|---|---|---|
| Supplies and Postage Expense | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Supplies and Postage Expense, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Name | Relation Type | Role | |
|---|---|---|---|
us-gaap:SuppliesExpense | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfIncome | |
us-gaap:PostageExpense | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
| Name | Relation Type | Role | |
|---|---|---|---|
us-gaap:GeneralAndAdministrativeExpense | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfIncome | |
us-gaap:NoninterestExpense | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfIncomeFirstAlternative | |
us-gaap:SuppliesAndPostageExpenseAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenue | |
us-gaap:SuppliesAndPostageExpenseAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenueStatementTable | |
us-gaap:SuppliesAndPostageExpenseAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncome | |
us-gaap:SuppliesAndPostageExpenseAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncomeStatementTable | |
us-gaap:ComponentOfOperatingOtherCostAndExpenseLineItems | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |