Note 5 - Credit Quality - Aging of Past Due Loans by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Non-covered	$ 2,519,833	$ 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	12,930	13,953
Financial Asset, 60 to 89 Days Past Due [Member]
Non-covered	3,642	6,194
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Non-covered	6,774	6,384
Financial Asset, Past Due [Member]
Non-covered	23,346	26,531
Financial Asset, Not Past Due [Member]
Non-covered	2,496,487	2,545,767
Commercial Portfolio Segment [Member]
Non-covered	1,626,818	1,661,493
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered	88,841	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	23	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	52	67
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]
Non-covered	88,789	105,878
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered	203,530	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	1,000	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	435	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	439	390
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]
Non-covered	1,874	2,388
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]
Non-covered	201,656	209,462
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered	194,188	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	112	115
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Non-covered	0	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	114	0
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]
Non-covered	226	183
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]
Non-covered	193,962	188,199
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered	219,669	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	688	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	0	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	219	232
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]
Non-covered	907	1,464
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]
Non-covered	218,762	223,431
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered	887,255	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	1,896	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	0	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	955	382
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]
Non-covered	2,851	1,228
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]
Non-covered	884,404	893,322
Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered	19,763	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	417	22
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Non-covered	272	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	246	217
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]
Non-covered	935	295
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]
Non-covered	18,828	21,374
Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered	13,572	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	123	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	0	0
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]
Non-covered	125	15
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]
Non-covered	13,447	14,187
Consumer Real Estate Portfolio Segment [Member]
Non-covered	780,839	792,211
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered	87,181	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	551	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	159	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	430	534
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]
Non-covered	1,140	1,516
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]
Non-covered	86,041	86,110
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered	687,810	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	5,204	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	1,841	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	3,780	3,519
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]
Non-covered	10,825	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	676,985	683,682
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered	5,848	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	5,848	8,445
Consumer and Other Portfolio Segment [Member]
Non-covered	112,176	118,594
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered	110,787	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	2,916	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	927	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	568	1,087
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, Past Due [Member] | Non-covered Loans [Member]
Non-covered	4,411	6,917
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, Not Past Due [Member] | Non-covered Loans [Member]
Non-covered	106,376	110,174
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered	1,389	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	$ 1,389	$ 1,503