Loans and Related Allowance for Loan Losses (Loans, Excluding PCI Loans, by Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	$ 1,177,709	$ 1,058,323
Loans And Leases Receivable Net Of Deferred Income	1,177,709	1,058,323
Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	908,222	854,925
Loans And Leases Receivable Net Of Deferred Income		854,925
Commercial Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	257,362	191,183
Loans And Leases Receivable Net Of Deferred Income		191,183
Consumer Installment Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	10,606	11,163
Loans And Leases Receivable Net Of Deferred Income		11,163
All Other Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	1,519	1,052
Loans And Leases Receivable Net Of Deferred Income		1,052
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	204,366	223,538
Loans And Leases Receivable Net Of Deferred Income		223,538
Commercial [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	452,677	396,858
Loans And Leases Receivable Net Of Deferred Income		396,858
Construction and Land Development [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	159,766	146,566
Loans And Leases Receivable Net Of Deferred Income		146,566
Second Mortgages [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	6,488	6,639
Loans And Leases Receivable Net Of Deferred Income		6,639
Multifamily [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	77,787	72,978
Loans And Leases Receivable Net Of Deferred Income		72,978
Agriculture [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	7,138	8,346
Loans And Leases Receivable Net Of Deferred Income		8,346
Loans Excluding PCI Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	1,177,709	1,058,323
Loans Excluding PCI Loans [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	908,222	854,925
Loans Excluding PCI Loans [Member] | Commercial Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	257,362	191,183
Loans Excluding PCI Loans [Member] | Consumer Installment Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	10,606	11,163
Loans Excluding PCI Loans [Member] | All Other Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	1,519	1,052
Loans Excluding PCI Loans [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	204,366	223,538
Loans Excluding PCI Loans [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	452,677	396,858
Loans Excluding PCI Loans [Member] | Construction and Land Development [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	159,766	146,566
Loans Excluding PCI Loans [Member] | Second Mortgages [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	6,488	6,639
Loans Excluding PCI Loans [Member] | Multifamily [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	77,787	72,978
Loans Excluding PCI Loans [Member] | Agriculture [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	7,138	8,346
Loans Excluding PCI Loans [Member] | Pass [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	1,022,788	1,038,267
Loans Excluding PCI Loans [Member] | Pass [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	788,370	840,952
Loans Excluding PCI Loans [Member] | Pass [Member] | Commercial Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	222,378	185,123
Loans Excluding PCI Loans [Member] | Pass [Member] | Consumer Installment Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	10,537	11,140
Loans Excluding PCI Loans [Member] | Pass [Member] | All Other Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	1,503	1,052
Loans Excluding PCI Loans [Member] | Pass [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	189,923	219,210
Loans Excluding PCI Loans [Member] | Pass [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	357,037	391,251
Loans Excluding PCI Loans [Member] | Pass [Member] | Construction and Land Development [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	158,447	145,782
Loans Excluding PCI Loans [Member] | Pass [Member] | Second Mortgages [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	5,286	6,096
Loans Excluding PCI Loans [Member] | Pass [Member] | Multifamily [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	70,964	70,515
Loans Excluding PCI Loans [Member] | Pass [Member] | Agriculture [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	6,713	8,098
Loans Excluding PCI Loans [Member] | Special Mention [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	143,469	10,137
Loans Excluding PCI Loans [Member] | Special Mention [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	115,750	7,351
Loans Excluding PCI Loans [Member] | Special Mention [Member] | Commercial Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	27,653	2,770
Loans Excluding PCI Loans [Member] | Special Mention [Member] | Consumer Installment Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	50	16
Loans Excluding PCI Loans [Member] | Special Mention [Member] | All Other Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	16
Loans Excluding PCI Loans [Member] | Special Mention [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	13,104	2,964
Loans Excluding PCI Loans [Member] | Special Mention [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	93,500	3,188
Loans Excluding PCI Loans [Member] | Special Mention [Member] | Construction and Land Development [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	747	408
Loans Excluding PCI Loans [Member] | Special Mention [Member] | Second Mortgages [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	1,202	543
Loans Excluding PCI Loans [Member] | Special Mention [Member] | Multifamily [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	6,823
Loans Excluding PCI Loans [Member] | Special Mention [Member] | Agriculture [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	374	248
Loans Excluding PCI Loans [Member] | Substandard [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	11,452	9,919
Loans Excluding PCI Loans [Member] | Substandard [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	4,102	6,622
Loans Excluding PCI Loans [Member] | Substandard [Member] | Commercial Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	7,331	3,290
Loans Excluding PCI Loans [Member] | Substandard [Member] | Consumer Installment Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	19	7
Loans Excluding PCI Loans [Member] | Substandard [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	1,339	1,364
Loans Excluding PCI Loans [Member] | Substandard [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	2,140	2,419
Loans Excluding PCI Loans [Member] | Substandard [Member] | Construction and Land Development [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	572	376
Loans Excluding PCI Loans [Member] | Substandard [Member] | Multifamily [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans		$ 2,463
Loans Excluding PCI Loans [Member] | Substandard [Member] | Agriculture [Member] | Mortgage Loans on Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total loans	$ 51