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Note 1 - Basis of Presentation - Impact of ASU 2016-13 (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Securities available for sale, fair value $ 87,643 $ 83,358 [1] $ 83,358 [2]    
Allowance for credit losses on loans (34,563) (26,182) [3] (26,182) $ (21,137) $ (18,425)
Deferred Tax Assets, Net of Valuation Allowance, Total [4]   17,493      
Accrued interest receivable - loans 8,724 9,052 [5] 9,052 [2]    
Allowance for credit losses on off-balance sheet credit exposures [6]   66      
Retained Earnings (Accumulated Deficit), Ending Balance $ 241,889 237,585 [7] 237,585 [2]    
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration [Member]          
Loans   2,146,972      
Financial Asset Acquired with Credit Deterioration [Member]          
Loans [5]   39,660      
Allowance for credit losses on loans   (5,880)      
Accounting Standards Update 2016-13 [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Allowance for credit losses on loans   (57)      
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Securities available for sale, fair value [1]   83,358      
Allowance for credit losses on loans [3]   (39,289)      
Deferred Tax Assets, Net of Valuation Allowance, Total [4]   19,306      
Accrued interest receivable - loans [5]   9,109      
Allowance for credit losses on off-balance sheet credit exposures [6]   575      
Retained Earnings (Accumulated Deficit), Ending Balance [7]   231,714      
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration [Member]          
Loans   2,146,972      
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Loans [5]   45,535      
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Securities available for sale, fair value [1]   0      
Allowance for credit losses on loans   (13,107) [3] $ (13,107)    
Deferred Tax Assets, Net of Valuation Allowance, Total [4]   1,813      
Accrued interest receivable - loans [5]   57      
Allowance for credit losses on off-balance sheet credit exposures [6]   509      
Retained Earnings (Accumulated Deficit), Ending Balance [7]   (5,871)      
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration [Member]          
Loans   0      
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Loans [5]   $ 5,875      
[1] Per our analysis no ACL was necessary for investment securities available-for-sale.
[2] Derived from audited financial statements
[3] Calculated adjustment to the ACL related to the adoption of ASU 2016-13. Additional reserve related to purchased deteriorated loans of $5.88 million.
[4] Effect of deferred tax assets related to the adjustment to the ACL form the adoption of ASU 2016-13 using a 23.37% tax rate.
[5] Accrued interest receivable from acquired credit impaired loans of $57 thousand was reclassed to other assets and was offset by the reclass of the grossed up credit discount on acquired credit impaired loans of $57 thousand that was moved to the ACL for the purchased credit deteriorated loans.
[6] Adjustment to the reserve for unfunded commitments related to the adoption of ASU 2016-13.
[7] Net adjustment to retained earnings related to the adoption of ASU 2016-13.