Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2017

Regulatory Matters [Abstract]

Schedule of Actual Capital Amounts and Ratios

										To Be Well
						For Capital				Capitalized Under
						Adequacy				Prompt Corrective
		Actual				Purposes*				Action Provisions*
(Dollars in thousands)		Amount	Ratio			Amount	Ratio			Amount	Ratio
DNB Financial Corporation
December 31, 2017:
Total risk-based capital	$	113,400	13.73	%	$	66,083	8.00	%		N/A	N/A
Common equity tier 1 capital		88,459	10.71			37,172	4.50			N/A	N/A
Tier 1 risk-based capital		97,459	11.80			49,562	6.00			N/A	N/A
Tier 1 (leverage) capital		97,459	9.19			42,426	4.00			N/A	N/A
December 31, 2016:
Total risk-based capital	$	105,669	12.50	%	$	67,640	8.00	%		N/A	N/A
Common equity tier 1 capital		81,201	9.60			38,048	4.50			N/A	N/A
Tier 1 risk-based capital		90,201	10.67			50,730	6.00			N/A	N/A
Tier 1 (leverage) capital		90,201	8.42			42,864	4.00			N/A	N/A
DNB First, N.A.
December 31, 2017:
Total risk-based capital	$	112,050	13.59	%	$	65,953	8.00	%	$	82,441	10.00	%
Common equity tier 1 capital		105,859	12.84			37,098	4.50			53,587	6.50
Tier 1 risk-based capital		105,859	12.84			49,465	6.00			65,953	8.00
Tier 1 (leverage) capital		105,859	9.99			42,378	4.00			52,972	5.00
December 31, 2016:
Total risk-based capital	$	103,094	12.22	%	$	67,511	8.00	%	$	84,388	10.00	%
Common equity tier 1 capital		97,376	11.54			37,975	4.50			54,852	6.50
Tier 1 risk-based capital		97,376	11.54			50,633	6.00			67,511	8.00
Tier 1 (leverage) capital		97,376	9.09			42,830	4.00			53,537	5.00

*Does not include capital conservation buffer of 0.625% for 2016 and 1.250% for 2017.