Consolidated Statements of Cash Flows (Parenthetical) (USD $)	Jun. 30, 2011
Consolidated Statements of Cash Flows
Amortized Cost Of Securities Transferred From AFS to HTM	$ 20,228

Name:

dnbf_AmortizedCostOfSecuritiesTransferredFromAfsToHtm

Namespace Prefix:

dnbf

Data Type:

xbrli:monetaryItemType

Balance Type:

debit

Period Type:

instant