Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital, amount	$ 124,769	$ 113,400
Total risk-based capital, ratio	13.61%	13.73%
Total risk-based capital for capital adequacy purposes, amount	$ 73,538	$ 66,083
Total risk-based capital for capital adequacy purposes, ratio	8.00%	8.00%
Common equity tier 1 capital, amount	$ 98,949	$ 88,459
Common equity tier 1 capital, ratio	10.79%	10.71%
Common equity tier 1 capital for capital adequacy purposes, amount	$ 41,365	$ 37,172
Common equity tier 1 capital for capital adequacy purposes, ratio	4.50%	4.50%
Tier 1 risk-based capital, amount	$ 107,949	$ 97,459
Tier 1 risk-based capital, ratio	11.77%	11.80%
Tier 1 risk-based capital required for capital adequacy, amount	$ 55,153	$ 49,562
Tier 1 risk-based capital required for capital adequacy, ratio	6.00%	6.00%
Tier 1 ( leverage) capital, amount	$ 107,949	$ 97,459
Tier 1 ( leverage) capital, ratio	9.48%	9.19%
Tier 1 ( leverage) capital required for capital adequacy, amount	$ 45,557	$ 42,426
Tier 1 ( leverage) capital required for capital adequacy, ratio	4.00%	4.00%
DNB First, N.A. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital, amount	$ 123,239	$ 112,050
Total risk-based capital, ratio	13.46%	13.59%
Total risk-based capital for capital adequacy purposes, amount	$ 73,399	$ 65,953
Total risk-based capital for capital adequacy purposes, ratio	8.00%	8.00%
Total risk-based capital required to be well capitalized, amount	$ 91,748	$ 82,441
Total risk-based capital required to be well capitalized, ratio	10.00%	10.00%
Common equity tier 1 capital, amount	$ 116,169	$ 105,859
Common equity tier 1 capital, ratio	12.69%	12.84%
Common equity tier 1 capital for capital adequacy purposes, amount	$ 41,287	$ 37,098
Common equity tier 1 capital for capital adequacy purposes, ratio	4.50%	4.50%
Common equity tier 1 capital to be well capitalized, amount	$ 59,636	$ 53,587
Common equity tier 1 capital to be well capitalized, ratio	6.50%	6.50%
Tier 1 risk-based capital, amount	$ 116,169	$ 105,859
Tier 1 risk-based capital, ratio	12.69%	12.84%
Tier 1 risk-based capital required for capital adequacy, amount	$ 55,049	$ 49,465
Tier 1 risk-based capital required for capital adequacy, ratio	6.00%	6.00%
Tier 1 risk-based capital required to be well capitalized, amount	$ 73,399	$ 65,953
Tier 1 risk-based capital required to be well capitalized, ratio	8.00%	8.00%
Tier 1 ( leverage) capital, amount	$ 116,169	$ 105,859
Tier 1 ( leverage) capital, ratio	10.21%	9.99%
Tier 1 ( leverage) capital required for capital adequacy, amount	$ 45,503	$ 42,378
Tier 1 ( leverage) capital required for capital adequacy, ratio	4.00%	4.00%
Tier 1 ( leverage) capital required to be well capitalized, amount	$ 56,879	$ 52,972
Tier 1 ( leverage) capital required to be well capitalized, ratio	5.00%	5.00%