FHLBP Advances and Short-Term Borrowed Funds (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	$ 17,000,000	$ 23,800,000
Assets Sold under Agreements to Repurchase, Interest Rate	0.30%	0.40%
Line of Credit Facility, Maximum Borrowing Capacity	195,200,000
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	178,200,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	20,000,000	20,000,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, General Description of Terms	At December 31, 2012, DNB had $20.0 million of outstanding long-term advances, which mature at various dates through the year-ended December 31, 2015, as shown in the table below. These advances are collateralized by loans and investment securities, and a lien on the Bank's FHLBP stock.
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Weighted Average Interest Rate	4.17%	4.17%
Other Borrowings	571,000	598,000
Line of Credit [Member]
Line of Credit Facility, Federal Home Loan Bank, Amount Outstanding	$ 20,000,000