XML 72 R63.htm IDEA: XBRL DOCUMENT
v3.22.2.2

DERIVATIVES AND HEDGING ACTIVITIES - Classification on Consolidated Statements of Financial Condition (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 USD ($) DerivativeInstrument | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) DerivativeInstrument | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) DerivativeInstrument
Cash Flow Hedges |  |  |  |  |
Collateral received against obligations in net asset position |  |  |  |  | $ 4,600,000
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Loan level derivative income | $ 549,000 | $ 445,000 | $ 2,240,000 | $ 2,796,000 |
Interest Rate Swaps Related to FHLBNY Advances [Member] | Designated as Hedging Instrument |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | DerivativeInstrument | 4 |  | 4 |  | 4
Notional amount, assets | $ 150,000,000 |  | $ 150,000,000 |  | $ 150,000,000
Fair value assets | $ 18,336,000 |  | $ 18,336,000 |  | $ 4,358,000
Loan Level Interest Rate Swaps with Borrower (Assets) | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | DerivativeInstrument |  |  |  |  | 98
Notional amount, assets |  |  |  |  | $ 599,003,000
Fair value assets |  |  |  |  | $ 27,440,000
Loan Level Interest Rate Swaps with Borrower (Liabilities) | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, liabilities | DerivativeInstrument | 187 |  | 187 |  |
Notional amount, liabilities | $ 1,225,306,000 |  | $ 1,225,306,000 |  |
Fair value liabilities | (133,938,000) |  | (133,938,000) |  |
Posted collateral | $ 0 |  | $ 0 |  |
Loan Level Interest Rate Swaps with Borrower 3 | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, liabilities | DerivativeInstrument |  |  |  |  | 87
Notional amount, liabilities |  |  |  |  | $ 612,610,000
Fair value liabilities |  |  |  |  | $ (12,620,000)
Loan Level Interest Rate Floors with Borrower | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, liabilities | DerivativeInstrument | 41 |  | 41 |  | 12
Notional amount, liabilities | $ 328,864,000 |  | $ 328,864,000 |  | $ 100,774,000
Fair value liabilities | (10,405,000) |  | (10,405,000) |  | $ (53,000)
Loan Level Interest Rate Floors with Borrower 2 | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | DerivativeInstrument |  |  |  |  | 33
Notional amount, assets |  |  |  |  | $ 291,990,000
Fair value assets |  |  |  |  | $ 615,000
Loan Level Interest Rate Swaps with Third-part Counterparties 2 | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, liabilities | DerivativeInstrument |  |  |  |  | 98
Notional amount, liabilities |  |  |  |  | $ 599,003,000
Fair value liabilities |  |  |  |  | (27,440,000)
Loan Level Interest Rate Swaps with Third-part Counterparties | Designated as Hedging Instrument |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Posted collateral | $ 0 |  | $ 0 |  | $ 0
Loan Level Interest Rate Swaps with Third-part Counterparties | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | DerivativeInstrument |  |  |  |  | 87
Count, liabilities | DerivativeInstrument | 187 |  | 187 |  |
Notional amount, assets | $ 1,225,306,000 |  | $ 1,225,306,000 |  | $ 612,610,000
Fair value assets | 133,938,000 |  | 133,938,000 |  | 12,620,000
Posted collateral | 0 |  | 0 |  | $ 14,000,000.0
Loan level interest rate swaps with third party counterparties (Assets) | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Posted collateral | $ 140,000,000.0 |  | $ 140,000,000.0 |  |
Loan Level Interest Rate Floors with Third-part Counterparties | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | DerivativeInstrument | 41 |  | 41 |  | 33
Notional amount, assets | $ 328,864,000 |  | $ 328,864,000 |  |
Notional amount, liabilities |  |  |  |  | $ 291,990,000
Fair value assets | $ 10,405,000 |  | $ 10,405,000 |  |
Fair value liabilities |  |  |  |  | $ (615,000)
Loan Level Interest Rate Floors with Third-part Counterparties 2 | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | DerivativeInstrument |  |  |  |  | 12
Notional amount, assets |  |  |  |  | $ 100,774,000
Fair value assets |  |  |  |  | $ 53,000

X
- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
Name: | us-gaap_CollateralAlreadyPostedAggregateFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of liability associated with 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeAssetFairValueGrossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeAssetNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of derivative instruments of a particular derivative asset or group of derivative assets held by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 + Details
Name: | us-gaap_DerivativeAssetNumberOfInstrumentsHeld
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226038-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=d3e41678-113959 + Details
Name: | us-gaap_DerivativeCollateralObligationToReturnCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
Name: | us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeLiabilityNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of derivative instruments of a particular derivative liability or group of derivative liabilities held by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeLiabilityNumberOfInstrumentsHeld
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=dcom_LoanLevelInterestRateSwapsWithBorrower2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=dcom_InterestRateSwapLoanLevelWithBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=dcom_LoanLevelInterestRateSwapsWithBorrower3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=dcom_InterestRateFloorLoanLevelWithBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=dcom_LoanLevelInterestRateFloorsWithBorrowerTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=dcom_LoanLevelInterestRateSwapsWithThirdPartCounterpartiesTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=dcom_InterestRateSwapLoanLevelWithThirdPartCounterpartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=dcom_LoanLevelInterestRateSwapsWithThirdPartCounterparties2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=dcom_InterestRateFloorLoanLevelWithThirdPartCounterpartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=dcom_LoanLevelInterestRateFloorsWithThirdPartCounterpartiesTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |