Loans and Related Allowance for Loan Losses (Summary of Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,058,323	$ 993,705
Percent of loans	100.00%	100.00%
Mortgage Loans on Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 854,925	$ 791,290
Percent of loans	80.79%	79.63%
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 223,538	$ 216,268
Percent of loans	21.12%	21.77%
Mortgage Loans on Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 396,858	$ 379,904
Percent of loans	37.50%	38.23%
Mortgage Loans on Real Estate [Member] | Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 146,566	$ 120,413
Percent of loans	13.85%	12.12%
Mortgage Loans on Real Estate [Member] | Second Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 6,639	$ 6,778
Percent of loans	0.63%	0.68%
Mortgage Loans on Real Estate [Member] | Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 72,978	$ 59,557
Percent of loans	6.90%	5.99%
Mortgage Loans on Real Estate [Member] | Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 8,346	$ 8,370
Percent of loans	0.79%	0.84%
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 191,183	$ 188,722
Percent of loans	18.06%	18.99%
Consumer Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 11,163	$ 12,048
Percent of loans	1.05%	1.21%
All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,052	$ 1,645
Percent of loans	0.10%	0.17%