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Note 2 - Securities - Fair Value of Debt Security, Available-for-sale and Held-to-maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Amortized Cost, available for sale $ 640,084 $ 1,102,146
Gross Unrealized Gains, available for sale 39 11,534
Gross Unrealized Losses, available for sale (73,981) (14,795)
Fair Value, available for sale 566,142 1,098,885
Amortized Cost, held to maturity 429,675  
Gross Unrealized Gains, held to maturity 0  
Gross Unrealized Losses, held to maturity (57,008)  
Fair Value, held to maturity 372,667  
US Treasury Securities [Member]    
Amortized Cost, available for sale 93,040 93,267
Gross Unrealized Gains, available for sale 0 23
Gross Unrealized Losses, available for sale (9,397) (1,311)
Fair Value, available for sale 83,643 91,979
US States and Political Subdivisions Debt Securities [Member]    
Amortized Cost, available for sale 300,824 528,252
Gross Unrealized Gains, available for sale 34 10,704
Gross Unrealized Losses, available for sale (44,197) (4,109)
Fair Value, available for sale 256,661 534,847
Amortized Cost, held to maturity 203,267  
Gross Unrealized Gains, held to maturity 0  
Gross Unrealized Losses, held to maturity (32,638)  
Fair Value, held to maturity 170,629  
Collateralized Mortgage-Backed Securities [Member]    
Amortized Cost, available for sale 230,842 441,383
Gross Unrealized Gains, available for sale 5 781
Gross Unrealized Losses, available for sale (19,719) (9,049)
Fair Value, available for sale 211,128 433,115
Amortized Cost, held to maturity 202,595  
Gross Unrealized Gains, held to maturity 0  
Gross Unrealized Losses, held to maturity (23,007)  
Fair Value, held to maturity 179,588  
Corporate Debt Securities [Member]    
Amortized Cost, available for sale 1,256 20,856
Gross Unrealized Gains, available for sale 0 19
Gross Unrealized Losses, available for sale (18) (233)
Fair Value, available for sale 1,238 20,642
Amortized Cost, held to maturity 19,593  
Gross Unrealized Gains, held to maturity 0  
Gross Unrealized Losses, held to maturity (1,013)  
Fair Value, held to maturity 18,580  
Asset-Backed Securities [Member]    
Amortized Cost, available for sale 14,122 16,387
Gross Unrealized Gains, available for sale 0 0
Gross Unrealized Losses, available for sale (650) (93)
Fair Value, available for sale 13,472 16,294
Amortized Cost, held to maturity 1,257  
Gross Unrealized Gains, held to maturity 0  
Gross Unrealized Losses, held to maturity (67)  
Fair Value, held to maturity 1,190  
US Treasury and Government [Member]    
Amortized Cost, available for sale 2,963 2,001
Gross Unrealized Gains, available for sale 0 7
Gross Unrealized Losses, available for sale (283) 0
Fair Value, available for sale $ 2,680 $ 2,008