Nature of Business and Its Significant Accounting Policies - Consolidation (Details)	12 Months Ended
	Dec. 31, 2019 subsidiary
Principles of Consolidation
Number of subsidiaries	2
The Bank of Delmarva | DHB Development LLC
Principles of Consolidation
Ownership interest (as a percent)	40.55%
The Bank of Delmarva | West Nithsdale Enterprises LLC
Principles of Consolidation
Ownership interest (as a percent)	10.00%
The Bank of Delmarva | FBW LLC
Principles of Consolidation
Ownership interest (as a percent)	50.00%
Virginia Partners Bank | Johnson Mortgage Company LLC
Principles of Consolidation
Ownership interest (as a percent)	51.00%