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Note 5 - Credit Quality - Aging of Past Due Loans by Loan Class (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Non-covered $ 2,473,268 $ 2,572,298
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 11,181 13,953
Financial Asset, 60 to 89 Days Past Due [Member]    
Non-covered 4,085 6,194
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Non-covered 7,396 6,384
Financial Asset, Past Due [Member]    
Non-covered 22,662 26,531
Financial Asset, Not Past Due [Member]    
Non-covered 2,450,606 2,545,767
Commercial Portfolio Segment [Member]    
Non-covered 1,596,936 1,661,493
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]    
Non-covered 81,693 105,945
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 6 38
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 6 6
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 23 23
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 35 67
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 81,658 105,878
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Non-covered 205,858 211,850
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 787 1,232
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 130 766
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 421 390
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 1,338 2,388
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 204,520 209,462
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]    
Non-covered 196,311 188,382
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 0 115
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 58 68
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 58 183
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 196,253 188,199
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]    
Non-covered 209,442 224,895
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 518 777
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 29 455
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 259 232
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 806 1,464
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 208,636 223,431
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]    
Non-covered 870,513 894,550
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 659 617
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 305 229
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 725 382
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 1,689 1,228
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 868,824 893,322
Commercial Portfolio Segment [Member] | Agricultural [Member]    
Non-covered 19,513 21,669
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 98 22
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 203 56
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 130 217
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 431 295
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 19,082 21,374
Commercial Portfolio Segment [Member] | Farmland [Member]    
Non-covered 13,606 14,202
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 15
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 2 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 162 0
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 164 15
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 13,442 14,187
Consumer Real Estate Portfolio Segment [Member]    
Non-covered 770,243 792,211
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]    
Non-covered 88,608 87,626
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 600 639
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 481 343
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 553 534
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 1,634 1,516
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 86,974 86,110
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]    
Non-covered 676,904 696,140
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 4,623 6,108
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 2,045 2,831
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 4,480 3,519
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 11,148 12,458
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 665,756 683,682
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]    
Non-covered 4,731 8,445
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 0
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 0
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 4,731 8,445
Consumer and Other Portfolio Segment [Member]    
Non-covered 106,089 118,594
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]    
Non-covered 104,503 117,091
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 3,890 4,390
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]    
Non-covered 826 1,440
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 643 1,087
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]    
Non-covered 5,359 6,917
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]    
Non-covered 99,144 110,174
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]    
Non-covered 1,586 1,503
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 $ 1,586 $ 1,503