Loans and Related Allowance for Loan Losses (Summary of Financial Receivable Impaired Average Recorded Investment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	$ 9,187	$ 16,201	$ 9,420	$ 16,753
Interest Recognized	60	65	122	127
Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	7,837	14,373	8,365	14,874
Interest Recognized	57	60	115	118
Commercial Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	1,339	1,822	1,045	1,875
Interest Recognized	3	5	7	9
Consumer Installment Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	11	6	10	4
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	3,155	3,667	3,097	3,676
Interest Recognized	21	23	43	45
Commercial [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	3,206	4,071	3,338	4,398
Interest Recognized	36	37	72	73
Construction and Land Development [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	1,450	4,096	1,092	4,254
Multifamily [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment		$ 2,539	821	$ 2,546
Agriculture [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Average Investment	$ 26		$ 17