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Note 2 - Acquisitions and Divestitures (Details Textual)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2020
USD ($)
Sep. 11, 2019
USD ($)
Oct. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Combination, Acquisition Related Costs         $ 1,893,000 $ 2,124,000 $ 0
Provision for Loan and Lease Losses, Total         12,668,000 3,571,000  
Goodwill, Impairment Loss $ 0   $ 1,490,000 $ 1,490,000 0 $ 0 1,492,000
Highlands Bankshares, Inc. [Member]              
Business Combination, Stock Conversion Ratio           0.2703  
Business Combination, Consideration Transferred, Total   $ 86,647,000       $ 86,650,000  
Acquired Loan, Fair Value Adjustments           (14,700,000)  
Deferred Loan Fees Excluded from Fair Value Adjustment of Acquired Loan           3,270,000  
Death Benefits Payable, Fair Value Adjustment           320,000  
Lease Liability, Fair Value Adjustment           (37,000)  
Reserve for Unfunded Commitments, Fair Value Adjustment           (85,000)  
Business Combination, Acquisition Related Costs         $ 1,890,000 2,120,000  
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed           7,160,000  
Provision for Loan and Lease Losses, Total           $ 738,000 $ 1,840,000