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Note 1 - Summary of Significant Accounting Policies - Impact of Adoption of Accounting Policy (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for credit losses on loans $ 53,898 $ 51,920 $ 36,647 $ 26,791 $ 25,534
Total allowance for credit losses on off-balance sheet exposures 2,200   3,850 350  
Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     9,856    
Total allowance for credit losses on off-balance sheet exposures [1]     3,500    
Home Equity Line of Credit [Member]          
Allowance for credit losses on loans 1,044 895 842 728  
Home Equity Line of Credit [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     114    
Commercial Real Estate Portfolio Segment [Member]          
Allowance for credit losses on loans 25,555 26,379 14,552 8,562  
Commercial Real Estate Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     5,990    
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]          
Allowance for credit losses on loans 15,960 19,396 8,333 5,235  
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     3,098    
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]          
Allowance for credit losses on loans 9,595 6,983 6,219 3,327  
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     2,892    
Commercial and Industrial Portfolio Segment [Member]          
Allowance for credit losses on loans       12,822 11,965
Commercial and Industrial Portfolio Segment [Member] | Term, Excluding PPP [Member]          
Allowance for credit losses on loans     7,147 6,782  
Commercial and Industrial Portfolio Segment [Member] | Term, Excluding PPP [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     365    
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member]          
Allowance for credit losses on loans 4,802 3,614 4,129 5,657  
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     (1,528)    
Total Commercial and Industrial Portfolio Segment [Member]          
Allowance for credit losses on loans 13,379 12,584 11,276 12,439  
Total Commercial and Industrial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     (1,163)    
Residential Real Estate Portfolio Segment [Member]          
Allowance for credit losses on loans 7,993 5,207 4,089 2,474  
Residential Real Estate Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     1,615    
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]          
Allowance for credit losses on loans 3,677 1,818 1,376 947  
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     429    
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member]          
Allowance for credit losses on loans 4,316 3,389 2,713 1,527  
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     1,186    
Construction and Development [Member]          
Allowance for credit losses on loans 4,789 6,119 5,161 2,105  
Construction and Development [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     3,056    
Consumer Portfolio Segment [Member]          
Allowance for credit losses on loans 772 340 398 100 $ 376
Consumer Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     298    
Finance Leases Portfolio Segment [Member]          
Allowance for credit losses on loans $ 204 $ 261 233 237  
Finance Leases Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     (4)    
Commercial Portfolio Segment [Member]          
Allowance for credit losses on loans     96 $ 146  
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses on loans [1]     $ (50)    
[1] The impact of the ASC 326 adoption on the ACL on loans reflects $8.2 million related to the transition from the incurred loss ACL model to the CECL ACL model and $1.6 million related to the transition from PCI to PCD methodology as defined in thestandard.