XML 76 R66.htm IDEA: XBRL DOCUMENT
v3.21.2

LOANS HELD FOR INVESTMENT, NET - Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment |  | $ 17,069
Individually evaluated for impairment |  | 6,474
Commercial real estate ("CRE") |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment |  | 2,704
Multifamily residential and residential mixed-use |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment |  | 1,863
Commercial and Industrial ("C&I") Loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment |  | 12,502
Individually evaluated for impairment |  | $ 6,474
Collateral Dependent Loans | Commercial real estate ("CRE") |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | $ 53,200 |
Individually evaluated for impairment | 7,600 |
Collateral Dependent Loans | Multifamily residential and residential mixed-use |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 8,500 |
Individually evaluated for impairment | 600 |
Collateral Dependent Loans | Commercial and Industrial ("C&I") Loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 4,400 |
Individually evaluated for impairment | $ 700 |

X
- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=dcom_MultifamilyResidentialAndResidentialMixedUseAllowanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=dcom_CollateralDependentLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |