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INCOME TAXES (Details) - item | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
INCOME TAXES |  |
Effective tax rate | 25.20% | 21.60%
Number of significant and unusual income tax items in the period | 0 | 0

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- Definition Refers to the number of significant and unusual income tax items in the period. + References No definition available. + Details
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Namespace Prefix: | dcom_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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