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Note 5 - Credit Quality - Aging of Past Due Loans by Loan Class (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Non-covered $ 2,362,733 $ 2,165,569
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered   0
Amortized Cost of > 90 Days Accruing No Allowance, Total 0  
Financial Asset, 30 to 59 Days Past Due [Member]    
Non-covered 10,445 11,434
Financial Asset, 60 to 89 Days Past Due [Member]    
Non-covered 4,307 5,220
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Non-covered 6,633 10,227
Financial Asset, Past Due [Member]    
Non-covered 21,385 26,881
Financial Asset, Not Past Due [Member]    
Non-covered 2,341,348 2,138,688
Commercial Portfolio Segment [Member]    
Non-covered 1,388,764 1,230,476
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]    
Non-covered 109,104 65,806
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 40 52
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 8 0
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 25 120
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 73 172
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 109,031 65,634
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Non-covered 148,024 133,630
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 319 325
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 186 35
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 45 1,394
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 550 1,754
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 147,474 131,876
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]    
Non-covered 135,489 100,402
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 97
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 0
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 0
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 97
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 135,489 100,305
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]    
Non-covered 196,133 198,778
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 398 1,210
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 239 583
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 335 795
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 972 2,588
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 195,161 196,190
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]    
Non-covered 777,350 707,506
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 780 1,002
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 441
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 1,377 2,333
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 2,157 3,776
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 775,193 703,730
Commercial Portfolio Segment [Member] | Agricultural [Member]    
Non-covered 10,537 9,341
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 30 73
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 18 7
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 11 101
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 59 181
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 10,478 9,160
Commercial Portfolio Segment [Member] | Farmland [Member]    
Non-covered 12,127 15,013
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 52
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 0
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 133 222
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 133 274
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 11,994 14,739
Consumer Real Estate Portfolio Segment [Member]    
Non-covered 818,806 800,631
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]    
Non-covered 77,424 79,857
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 425 275
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 183 388
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 309 333
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 917 996
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 76,507 78,861
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]    
Non-covered 726,780 703,864
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 4,686 4,740
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 2,057 2,584
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 3,454 3,880
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 10,197 11,204
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 716,583 692,660
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]    
Non-covered 14,602 16,910
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 139
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 0
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 0
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 139
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 14,602 16,771
Consumer and Other Portfolio Segment [Member]    
Non-covered 155,163 134,462
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]    
Non-covered 151,022 129,794
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 3,767 3,469
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 1,616 1,182
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 944 1,049
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 6,327 5,700
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 144,695 124,094
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]    
Non-covered 4,141 4,668
Amortized Cost of > 90 Days Accruing No Allowance, Non-covered 0 0
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 0
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 0
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 0
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 0 0
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered $ 4,141 $ 4,668