Liberty Bell Transaction - Fair Value of Loans Acquired (Details) - Liberty Bell Bank $ in Thousands	Mar. 01, 2018 USD ($)
Fair value adjustments made to the amortized cost basis to present a fair value of the loans acquired
Gross principal balance	$ 124,545
Fair value adjustment on pools of non‑credit impaired loans	(1,703)
Fair value adjustment on purchased credit impaired loans	(1,168)
Fair value of acquired loans	$ 121,674

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer this element represents the fair value adjustment on pools of non‑credit impaired loans.

No definition available.

+ Details

Name:	dbcp_BusinessCombinationAcquiredReceivablesFairValueAdjustmentOnPoolsOfNonCreditImpairedLoans
Namespace Prefix:	dbcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer this element represents the fair value adjustment on purchased credit impaired loans.

+ References

No definition available.

+ Details

Name:	dbcp_BusinessCombinationAcquiredReceivablesFairValueAdjustmentOnPurchasedCreditImpairedLoans
Namespace Prefix:	dbcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_BusinessCombinationAcquiredReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dbcp_LibertyBellBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: