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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
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Individually evaluated impairment $ 13,911   $ 16,217      
Collectively evaluated impairment 73,608   58,358      
Total 91,717 $ 82,739 78,773 $ 77,986 $ 78,684 $ 79,226
Individually evaluated impairment 101,885   101,949      
Collectively evaluated impairment 7,797,493   6,722,164      
Total 7,910,013   6,838,351      
Financial Asset Acquired with Credit Deterioration [Member]            
Individually evaluated impairment 4,198   4,198      
Individually evaluated impairment 10,635   14,238      
Commercial Portfolio Segment [Member]            
Individually evaluated impairment 10,600   15,131      
Collectively evaluated impairment 16,812   8,561      
Total 29,689 28,135 25,969 27,336 25,567 28,443
Individually evaluated impairment 29,482   33,726      
Collectively evaluated impairment 1,414,286   1,260,537      
Total [1] 1,448,727   1,299,428      
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Individually evaluated impairment 2,277   2,277      
Individually evaluated impairment 4,959   5,165      
Commercial Real Estate Portfolio Segment [Member]            
Individually evaluated impairment 3,235   955      
Collectively evaluated impairment 49,370   42,713      
Total 54,526 47,562 45,589 43,342 43,815 39,330
Individually evaluated impairment 59,042   49,310      
Collectively evaluated impairment 5,602,130   4,686,346      
Total 5,666,848   4,741,590      
Commercial Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Individually evaluated impairment 1,921   1,921      
Individually evaluated impairment 5,676   5,934      
Commercial Construction Portfolio Segment [Member]            
Individually evaluated impairment 0   0      
Collectively evaluated impairment 3,444   3,580      
Total 3,444 3,413 3,580 3,702 4,927 8,194
Individually evaluated impairment 7,727   13,196      
Collectively evaluated impairment 529,596   526,982      
Total 537,323   540,178      
Commercial Construction Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Individually evaluated impairment 0   0      
Individually evaluated impairment 0   0      
Residential Portfolio Segment [Member]            
Individually evaluated impairment 76   131      
Collectively evaluated impairment 3,977   3,497      
Total 4,053 3,625 3,628 3,598 4,366 2,687
Individually evaluated impairment 5,634   5,717      
Collectively evaluated impairment 250,451   246,413      
Total 256,085   255,269      
Residential Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Individually evaluated impairment 0   0      
Individually evaluated impairment 0   3,139      
Consumer Portfolio Segment [Member]            
Individually evaluated impairment 0   0      
Collectively evaluated impairment 5   7      
Total 5 $ 4 7 $ 8 $ 9 $ 4
Individually evaluated impairment 0   0      
Collectively evaluated impairment 1,030   1,886      
Total 1,030   1,886      
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Individually evaluated impairment 0   0      
Individually evaluated impairment $ 0   $ 0      
[1] Includes PPP loans of $11.5 million and $93.1 million as of September 30, 2022 and December 31, 2021 , respectively.