Loans and Related Allowance for Loan Losses (Summary of Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,230,981	$ 1,182,362
Percent of loans	100.00%	100.00%
Mortgage Loans on Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,016,466	$ 945,541
Percent of loans	82.57%	79.97%
Mortgage Loans on Real Estate [Member] \| Residential 1-4 Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 178,099	$ 197,228
Percent of loans	14.47%	16.68%
Mortgage Loans on Real Estate [Member] \| Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 542,418	$ 474,856
Percent of loans	44.06%	40.16%
Mortgage Loans on Real Estate [Member] \| Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 200,878	$ 182,277
Percent of loans	16.32%	15.42%
Mortgage Loans on Real Estate [Member] \| Second Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 7,078	$ 6,360
Percent of loans	0.57%	0.54%
Mortgage Loans on Real Estate [Member] \| Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 80,245	$ 78,158
Percent of loans	6.52%	6.61%
Mortgage Loans on Real Estate [Member] \| Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 7,748	$ 6,662
Percent of loans	0.63%	0.56%
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 206,801	$ 225,386
Percent of loans	16.80%	19.06%
Consumer Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 6,841	$ 9,996
Percent of loans	0.56%	0.85%
All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 873	$ 1,439
Percent of loans	0.07%	0.12%

Community Bankers Trust Corp 10-Q