Loans and Related Allowance for Loan Losses (Summary of Financial Receivable Impaired Average Recorded Investment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	$ 14,110	$ 16,394
Interest Recognized	248	430
Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	12,719	15,216
Interest Recognized	232	411
Commercial Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	1,386	1,175
Interest Recognized	16	19
Consumer Installment Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	5	3
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	3,395	3,993
Interest Recognized	87	124
Commercial [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	4,096	4,822
Interest Recognized	145	164
Construction and Land Development [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	2,709	4,839
Multifamily [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	$ 2,519	1,535
Interest Recognized		123
Agriculture [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment		$ 27