Regulatory Matters (Schedule of Actual Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital, amount		$ 113,400	$ 105,669
Total risk-based capital, ratio		13.73%	12.50%
Total risk-based capital for capital adequacy purposes, amount	[1]	$ 66,083	$ 67,640
Total risk-based capital for capital adequacy purposes, ratio	[1]	8.00%	8.00%
Common equity tier 1 capital, amount		$ 88,459	$ 81,201
Common equity tier 1 capital, ratio		10.71%	9.60%
Common equity tier 1 capital for capital adequacy purposes, amount	[1]	$ 37,172	$ 38,048
Common equity tier 1 capital for capital adequacy purposes, ratio	[1]	4.50%	4.50%
Tier 1 risk-based capital, amount		$ 97,459	$ 90,201
Tier 1 risk-based capital, ratio		11.80%	10.67%
Tier 1 risk-based capital required for capital adequacy, amount	[1]	$ 49,562	$ 50,730
Tier 1 risk-based capital required for capital adequacy, ratio	[1]	6.00%	6.00%
Tier 1 ( leverage) capital, amount		$ 97,459	$ 90,201
Tier 1 ( leverage) capital, ratio		9.19%	8.42%
Tier 1 ( leverage) capital required for capital adequacy, amount	[1]	$ 42,426	$ 42,864
Tier 1 ( leverage) capital required for capital adequacy, ratio	[1]	4.00%	4.00%
DNB First, N.A. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital, amount		$ 112,050	$ 103,094
Total risk-based capital, ratio		13.59%	12.22%
Total risk-based capital for capital adequacy purposes, amount	[1]	$ 65,953	$ 67,511
Total risk-based capital for capital adequacy purposes, ratio	[1]	8.00%	8.00%
Total risk-based capital required to be well capitalized, amount	[1]	$ 82,441	$ 84,388
Total risk-based capital required to be well capitalized, ratio	[1]	10.00%	10.00%
Common equity tier 1 capital, amount		$ 105,859	$ 97,376
Common equity tier 1 capital, ratio		12.84%	11.54%
Common equity tier 1 capital for capital adequacy purposes, amount	[1]	$ 37,098	$ 37,975
Common equity tier 1 capital for capital adequacy purposes, ratio	[1]	4.50%	4.50%
Common equity tier 1 capital to be well capitalized, amount	[1]	$ 53,587	$ 54,852
Common equity tier 1 capital to be well capitalized, ratio	[1]	6.50%	6.50%
Tier 1 risk-based capital, amount		$ 105,859	$ 97,376
Tier 1 risk-based capital, ratio		12.84%	11.54%
Tier 1 risk-based capital required for capital adequacy, amount	[1]	$ 49,465	$ 50,633
Tier 1 risk-based capital required for capital adequacy, ratio	[1]	6.00%	6.00%
Tier 1 risk-based capital required to be well capitalized, amount	[1]	$ 65,953	$ 67,511
Tier 1 risk-based capital required to be well capitalized, ratio	[1]	8.00%	8.00%
Tier 1 ( leverage) capital, amount		$ 105,859	$ 97,376
Tier 1 ( leverage) capital, ratio		9.99%	9.09%
Tier 1 ( leverage) capital required for capital adequacy, amount	[1]	$ 42,378	$ 42,830
Tier 1 ( leverage) capital required for capital adequacy, ratio	[1]	4.00%	4.00%
Tier 1 ( leverage) capital required to be well capitalized, amount	[1]	$ 52,972	$ 53,537
Tier 1 ( leverage) capital required to be well capitalized, ratio	[1]	5.00%	5.00%

[1] Does not include capital conservation buffer of 0.625% for 2016 and 1.250% for 2017.