| Name | PaymentsToAcquireMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale |
|---|---|
| Namespace | http://fasb.org/us-gaap/2020-01-31 |
| Prefix | us-gaap |
| Data type | xbrli:monetaryItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | credit |
| Nillable | True |
| Abstract | False |
| Text | Lang | Role | Container role |
|---|---|---|---|
| Payments to Acquire Mortgage-backed Securities (MBS), Available-for-sale | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Amount of cash outflow for purchase of mortgage-backed security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Name | Value | Role |
|---|---|---|
| SourceName | Financial Instruments-Recognition and Measurement | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2018 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2017-08 | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedReferences | true | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedLabels | true | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedDocumentation | true | http://fasb.org/srt/role/changeNote/changeNote |
| PreviousDocumentation | The cash outflow for the purchase of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as available for sale when acquired. | http://fasb.org/srt/role/changeNote/changeNote |
| Source_ASU_Number | 2016-01 | http://fasb.org/srt/role/changeNote/changeNote |
| Publisher | FASB | http://www.xbrl.org/2009/role/commonPracticeRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2009/role/commonPracticeRef |
| Topic | 230 | http://www.xbrl.org/2009/role/commonPracticeRef |
| SubTopic | 10 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Section | 45 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Paragraph | 11 | http://www.xbrl.org/2009/role/commonPracticeRef |
| URI | http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Publisher | FASB | http://www.xbrl.org/2009/role/commonPracticeRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2009/role/commonPracticeRef |
| Topic | 230 | http://www.xbrl.org/2009/role/commonPracticeRef |
| SubTopic | 10 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Section | 45 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Paragraph | 13 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Subparagraph | (a) | http://www.xbrl.org/2009/role/commonPracticeRef |
| URI | http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Name | Relation Type | Role | |
|---|---|---|---|
us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirect | |
us-gaap:PaymentsToAcquireInvestmentsAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectDepositBasedOperations | |
us-gaap:PaymentsToAcquireInvestmentsAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectDepositBasedOperationsStatementTable | |
us-gaap:PaymentsToAcquireInvestmentsAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectInvestmentBasedOperations | |
us-gaap:PaymentsToAcquireInvestmentsAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectInvestmentBasedOperationsStatementTable |