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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
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Individually evaluated impairment $ 16,264   $ 16,217      
Collectively evaluated impairment 62,277   58,358      
Total 82,739 $ 80,070 78,773 $ 78,684 $ 80,568 $ 79,226
Individually evaluated impairment 104,450   101,949      
Collectively evaluated impairment 7,167,150   6,722,164      
Total 7,282,423   6,838,351      
Financial Asset Acquired with Credit Deterioration [Member]            
Individually evaluated impairment 4,198   4,198      
Individually evaluated impairment 10,823   14,238      
Commercial Portfolio Segment [Member]            
Individually evaluated impairment 13,671   15,131      
Collectively evaluated impairment 12,187   8,561      
Total 28,135 25,459 25,969 25,567 26,435 28,443
Individually evaluated impairment 32,163   33,726      
Collectively evaluated impairment 1,317,400   1,260,537      
Total [1] 1,354,625   1,299,428      
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Individually evaluated impairment 2,277   2,277      
Individually evaluated impairment 5,062   5,165      
Commercial Real Estate Portfolio Segment [Member]            
Individually evaluated impairment 2,505   955      
Collectively evaluated impairment 43,136   42,713      
Total 47,562 47,868 45,589 43,815 43,897 39,330
Individually evaluated impairment 59,746   49,310      
Collectively evaluated impairment 5,041,875   4,686,346      
Total 5,107,382   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 5,761   5,934      
Commercial Construction Portfolio Segment [Member]            
Individually evaluated impairment 0   0      
Collectively evaluated impairment 3,413   3,580      
Total 3,413 3,281 3,580 4,927 5,521 8,194
Individually evaluated impairment 7,177   13,196      
Collectively evaluated impairment 562,612   526,982      
Total 569,789   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 88   131      
Collectively evaluated impairment 3,537   3,497      
Total 3,625 3,455 3,628 4,366 4,704 2,687
Individually evaluated impairment 5,364   5,717      
Collectively evaluated impairment 244,015   246,413      
Total 249,379   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 4   7      
Total 4 $ 7 7 $ 9 $ 11 $ 4
Individually evaluated impairment 0   0      
Collectively evaluated impairment 1,248   1,886      
Total 1,248   1,886      
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Individually evaluated impairment 0   0      
Individually evaluated impairment $ 0   $ 0      
[1] Included in commercial loans as of June 30, 2022 and December 31, 2021 are PPP loans of $18.0 million and $93.1 million, respectively.