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Note 5 - Loans and the Allowance for Credit Losses - Impairment Evaluation on Loans and Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Individually analyzed $ 0 $ 941    
Collectively evaluated 82,609 80,616    
Total 82,869 81,974 $ 87,002 $ 90,513
Individually analyzed 46,022 69,963    
Collectively evaluated 8,257,605 8,281,394    
Total 8,304,101 8,351,841    
Financial Asset Acquired with Credit Deterioration [Member]        
Individually analyzed 260 417    
Individually analyzed 474 484    
Commercial Portfolio Segment [Member]        
Individually analyzed 0 0    
Collectively evaluated 20,475 20,215    
Total 20,735 20,632 26,162 28,903
Individually analyzed 11,980 15,336    
Collectively evaluated 1,560,040 1,562,910    
Total 1,572,494 1,578,730    
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Individually analyzed 260 417    
Individually analyzed 474 484    
Commercial Real Estate Portfolio Segment [Member]        
Individually analyzed 0 941    
Collectively evaluated 52,794 51,337    
Total 52,794 52,278 53,000 53,742
Individually analyzed 33,210 39,986    
Collectively evaluated 5,796,740 5,855,559    
Total 5,829,950 5,895,545    
Commercial Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Individually analyzed 0 0    
Individually analyzed 0 0    
Commercial Construction Portfolio Segment [Member]        
Individually analyzed 0 0    
Collectively evaluated 5,011 4,739    
Total 5,011 4,739 3,966 3,718
Individually analyzed 0 8,700    
Collectively evaluated 646,593 611,796    
Total 646,593 620,496    
Commercial Construction Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Individually analyzed 0 0    
Individually analyzed 0 0    
Residential Portfolio Segment [Member]        
Individually analyzed 0 0    
Collectively evaluated 4,326 4,320    
Total 4,326 4,320 3,868 4,143
Individually analyzed 832 5,941    
Collectively evaluated 253,382 250,100    
Total 254,214 256,041    
Residential Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Individually analyzed 0 0    
Individually analyzed 0 0    
Consumer Portfolio Segment [Member]        
Individually analyzed 0 0    
Collectively evaluated 3 5    
Total 3 5 $ 6 $ 7
Individually analyzed 0 0    
Collectively evaluated 850 1,029    
Total 850 1,029    
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Individually analyzed 0 0    
Individually analyzed $ 0 $ 0