| **FAIR VALUE (Fair Value Measurements, Recurring) (Details) - USD ($) $ in Thousands** | Jun. 30, 2020 | Dec. 31, 2019 |
|----------------------------------------------------------------------------------------|---------------|---------------|
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | $ 12,047,923  | $ 14,339,758  |
| Other investments - trading securities                                                 | 19,766        | 1,097         |
| RICs held-for-investment                                                               | 72,900        | 102,000       |
| LHFS                                                                                   | 241,300       | 289,000       |
| Other assets - derivatives                                                             | 1,644,784     | 555,896       |
| **Financial liabilities:**                                                             |          |          |
| Other liabilities - derivatives                                                        | 1,424,258     | 537,008       |
| Total MSRs                                                                             | 90,231        | 132,683       |
| U.S. Treasury securities                                                               |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 1,521,795     | 4,090,938     |
| Corporate debt                                                                         |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 98,486        | 139,713       |
| ABS                                                                                    |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 113,265       | 138,400       |
| State and municipal securities                                                         |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 5             | 9             |
| Recurring                                                                              |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 12,047,923    | 14,339,758    |
| Other investments - trading securities                                                 | 19,766        | 1,097         |
| RICs held-for-investment                                                               | 72,862        | 101,968       |
| LHFS                                                                                   | 241,250       | 289,009       |
| MSRs                                                                                   | 88,674        | 130,855       |
| Other assets - derivatives                                                             | 1,645,386     | 556,331       |
| Total financial assets                                                                 | 14,115,861    | 15,419,018    |
| **Financial liabilities:**                                                             |          |          |
| Other liabilities - derivatives                                                        | 1,434,883     | 546,414       |
| Total financial liabilities                                                            | 1,434,883     | 546,414       |
| Recurring | U.S. Treasury securities                                                   |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 1,521,795     | 4,090,938     |
| Recurring | Corporate debt                                                             |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 98,486        | 139,713       |
| Recurring | ABS                                                                        |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 113,265       | 138,400       |
| Recurring | State and municipal securities                                             |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 5             | 9             |
| Recurring | MBS                                                                        |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 10,314,372    | 9,970,698     |
| Recurring | Level 1                                                                    |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 0             | 0             |
| Other investments - trading securities                                                 | 0             | 379           |
| RICs held-for-investment                                                               | 0             | 0             |
| LHFS                                                                                   | 0             | 0             |
| MSRs                                                                                   | 0             | 0             |
| Other assets - derivatives                                                             | 0             | 0             |
| Total financial assets                                                                 | 0             | 379           |
| **Financial liabilities:**                                                             |          |          |
| Other liabilities - derivatives                                                        | 0             | 0             |
| Total financial liabilities                                                            | 0             | 0             |
| Recurring | Level 1 | U.S. Treasury securities                                         |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 0             | 0             |
| Recurring | Level 1 | Corporate debt                                                   |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 0             | 0             |
| Recurring | Level 1 | ABS                                                              |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 0             | 0             |
| Recurring | Level 1 | State and municipal securities                                   |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 0             | 0             |
| Recurring | Level 1 | MBS                                                              |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 0             | 0             |
| Recurring | Level 2                                                                    |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 11,997,259    | 14,276,523    |
| Other investments - trading securities                                                 | 19,766        | 718           |
| RICs held-for-investment                                                               | 0             | 17,634        |
| LHFS                                                                                   | 241,250       | 289,009       |
| MSRs                                                                                   | 0             | 0             |
| Other assets - derivatives                                                             | 1,628,619     | 553,222       |
| Total financial assets                                                                 | 13,886,894    | 15,137,106    |
| **Financial liabilities:**                                                             |          |          |
| Other liabilities - derivatives                                                        | 1,428,086     | 543,560       |
| Total financial liabilities                                                            | 1,428,086     | 543,560       |
| Recurring | Level 2 | U.S. Treasury securities                                         |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 1,521,795     | 4,090,938     |
| Recurring | Level 2 | Corporate debt                                                   |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 98,486        | 139,713       |
| Recurring | Level 2 | ABS                                                              |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 62,601        | 75,165        |
| Recurring | Level 2 | State and municipal securities                                   |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 5             | 9             |
| Recurring | Level 2 | MBS                                                              |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 10,314,372    | 9,970,698     |
| Recurring | Level 3                                                                    |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 50,664        | 63,235        |
| Other investments - trading securities                                                 | 0             | 0             |
| RICs held-for-investment                                                               | 72,862        | 84,334        |
| LHFS                                                                                   | 0             | 0             |
| MSRs                                                                                   | 88,674        | 130,855       |
| Other assets - derivatives                                                             | 16,767        | 3,109         |
| Total financial assets                                                                 | 228,967       | 281,533       |
| **Financial liabilities:**                                                             |          |          |
| Other liabilities - derivatives                                                        | 6,797         | 2,854         |
| Total financial liabilities                                                            | $ 6,797       | 2,854         |
| Percentage of level 3 assets to total assets held at fair value                        | 1.60%         |          |
| Percentage of level 3 assets to total assets                                           | 0.20%         |          |
| Recurring | Level 3 | U.S. Treasury securities                                         |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | $ 0           | 0             |
| Recurring | Level 3 | Corporate debt                                                   |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 0             | 0             |
| Recurring | Level 3 | ABS                                                              |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 50,664        | 63,235        |
| Recurring | Level 3 | State and municipal securities                                   |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | 0             | 0             |
| Recurring | Level 3 | MBS                                                              |          |          |
| **Financial assets:**                                                                  |          |          |
| AFS investment securities                                                              | $ 0           | $ 0           |

| X                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of Level 3 Assets to Total Assets
+ References
No definition available.
+ Details**Name:**sov_PercentageOfLevel3AssetsToTotalAssets**Namespace Prefix:**sov_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of Level 3 assets to total assets held at fair value
+ References
No definition available.
+ Details**Name:**sov_PercentageOfLevel3AssetsToTotalAssetsHeldAtFairValue**Namespace Prefix:**sov_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258
+ Details**Name:**us-gaap_AssetsFairValueDisclosure**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - References
No definition available.
+ Details**Name:**us-gaap_AssetsFairValueDisclosureAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
+ References
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563
+ Details**Name:**us-gaap_AvailableForSaleSecuritiesDebtSecurities**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312
+ Details**Name:**us-gaap_DerivativeAssets**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313
+ Details**Name:**us-gaap_DerivativeLiabilities**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of financial and nonfinancial obligations.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258
+ Details**Name:**us-gaap_LiabilitiesFairValueDisclosure**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - References
No definition available.
+ Details**Name:**us-gaap_LiabilitiesFairValueDisclosureAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.
+ References
No definition available.
+ Details**Name:**us-gaap_LoansHeldForSaleFairValueDisclosure**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772
+ Details**Name:**us-gaap_LoansReceivableFairValueDisclosure**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.
+ References
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745
+ Details**Name:**us-gaap_ServicingAsset**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.
+ References
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745
+ Details**Name:**us-gaap_ServicingAssetAtFairValueAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878
+ Details**Name:**us-gaap_TradingSecurities**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |