Amount of deposit discount accretion remainder of fiscal year.

No definition available.

Name:	dbcp_DepositDiscountAccretionRemainderOfFiscalYear
Namespace Prefix:	dbcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of accretion of net deposits purchase discount expected to be recognized during the fourth fiscal year following the latest fiscal year.

No definition available.

Name:	dbcp_DepositDiscountAccretionYearFour
Namespace Prefix:	dbcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of accretion of net deposits purchase discount expected to be recognized during the third fiscal year following the latest fiscal year.

No definition available.

Name:	dbcp_DepositDiscountAccretionYearThree
Namespace Prefix:	dbcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of accretion of net deposits purchase discount expected to be recognized during the second fiscal year following the latest fiscal year.

No definition available.

Name:	dbcp_DepositDiscountAccretionYearTwo
Namespace Prefix:	dbcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of deposit premium (discount) on acquired time deposits net of related amortization and accretion.

No definition available.

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

No definition available.

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

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=dbcp_DepositsPurchasedPremiumDiscountNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Goodwill and Intangible Assets - Deposits Purchased Premium and Discount, Amortization and Accretion (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Remaining accretion
2020	$ (8)
2021	(15)
2022	(6)
2023	(2)
Net deposit discount	(31)
Deposits Purchased Premium (Discount) Net
Remaining accretion
Net deposit discount	$ (31)	$ (31)	$ 27