Acquisition (Summary of Consideration Paid) (Details) - USD ($)	Jul. 01, 2021	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill Recorded in Acquisition		$ 19,628,000	$ 7,053,000
Landmark Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Landmark shares settled for stock	2,382,695
Exchange ratio	0.272
Total FDBC shares issued	647,990
Value assigned to FDBC common share (06/30/2021 closing price)	$ 54.10
Purchase price assigned to Landmark common shares exchanged for FDBC common shares	$ 35,056,259
Cash consideration (per Landmark share)	$ 3.26
Cash portion of purchase price	$ 7,767,586
Cash portion of purchase price (cash paid fractional shares)	5,559
Cash paid for outstanding Landmark stock options	69,250
Total consideration paid	42,898,654
Total Purchase Price	42,899,000
Cash and cash equivalents	4,090,000
Investment securities	49,430,000
Loans	298,860,000
Restricted investments in bank stock	1,186,000
Premises and equipment	3,405,000
Lease property under finance leases	1,188,000
Core deposit intangible asset	597,000
Other real estate owned	488,000
Other assets	11,629,000
Total assets acquired	370,873,000
Non-interest bearing deposits	100,472,000
Interest bearing deposits	208,057,000
Short-term borrowings	2,224,000
FHLB borrowings	4,602,000
Secured borrowings	20,619,000
Finance lease obligations	1,188,000
Other liabilities	3,387,000
Total liabilities assumed	340,549,000
Net Assets Acquired	30,324,000
Goodwill Recorded in Acquisition	$ 12,575,000