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Note 2 - Securities - Schedule of Maturities of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Less than 1 Year $ 34,110  
1 Year - 5 Years 131,140  
5 Years - 10 Years 393,875  
More than 10 Years 90,205  
Fair Value, available for sale 641,048 $ 1,098,885
Equity securities 8,282 8,492
Total Available for Sale 649,330  
Investment securities held to maturity, amortized cost, 1 year or less 6,266  
Investment securities held to maturity, amortized cost, over 1 to 5 years 51,259  
Investment securities held to maturity, amortized cost, over 5 to 10 years 272,319  
Investment securities held to maturity, amortized cost, over 10 years 100,074  
Investment securities held to maturity, amortized cost, subtotal 429,918  
US Treasury and Government [Member]    
Less than 1 Year 0  
1 Year - 5 Years 0  
5 Years - 10 Years 0  
More than 10 Years 0  
Fair Value, available for sale 0 2,008
Investment securities held to maturity, amortized cost, 1 year or less 0  
Investment securities held to maturity, amortized cost, over 1 to 5 years 0  
Investment securities held to maturity, amortized cost, over 5 to 10 years 2,962  
Investment securities held to maturity, amortized cost, over 10 years 0  
Investment securities held to maturity, amortized cost, subtotal 2,962  
US Treasury Securities [Member]    
Less than 1 Year 2,007  
1 Year - 5 Years 0  
5 Years - 10 Years 84,484  
More than 10 Years 0  
Fair Value, available for sale 86,491 91,979
Investment securities held to maturity, amortized cost, 1 year or less 0  
Investment securities held to maturity, amortized cost, over 1 to 5 years 0  
Investment securities held to maturity, amortized cost, over 5 to 10 years 0  
Investment securities held to maturity, amortized cost, over 10 years 0  
Investment securities held to maturity, amortized cost, subtotal 0  
US States and Political Subdivisions Debt Securities [Member]    
Less than 1 Year 17,913  
1 Year - 5 Years 34,667  
5 Years - 10 Years 185,902  
More than 10 Years 73,906  
Fair Value, available for sale 312,388 534,847
Investment securities held to maturity, amortized cost, 1 year or less 2,755  
Investment securities held to maturity, amortized cost, over 1 to 5 years 4,608  
Investment securities held to maturity, amortized cost, over 5 to 10 years 97,764  
Investment securities held to maturity, amortized cost, over 10 years 99,074  
Investment securities held to maturity, amortized cost, subtotal 204,201  
Corporate Debt Securities [Member]    
Less than 1 Year 501  
1 Year - 5 Years 508  
5 Years - 10 Years 246  
More than 10 Years 0  
Fair Value, available for sale 1,255 20,642
Investment securities held to maturity, amortized cost, 1 year or less 0  
Investment securities held to maturity, amortized cost, over 1 to 5 years 250  
Investment securities held to maturity, amortized cost, over 5 to 10 years 15,911  
Investment securities held to maturity, amortized cost, over 10 years 1,000  
Investment securities held to maturity, amortized cost, subtotal 17,161  
Asset-Backed Securities [Member]    
Less than 1 Year 0  
1 Year - 5 Years 10,305  
5 Years - 10 Years 3,940  
More than 10 Years 0  
Fair Value, available for sale 14,245 16,294
Investment securities held to maturity, amortized cost, 1 year or less 0  
Investment securities held to maturity, amortized cost, over 1 to 5 years 1,429  
Investment securities held to maturity, amortized cost, over 5 to 10 years 0  
Investment securities held to maturity, amortized cost, over 10 years 0  
Investment securities held to maturity, amortized cost, subtotal 1,429  
Debt Securities [Member]    
Less than 1 Year 20,421  
1 Year - 5 Years 45,480  
5 Years - 10 Years 274,572  
More than 10 Years 73,906  
Fair Value, available for sale 414,379  
Investment securities held to maturity, amortized cost, 1 year or less 2,755  
Investment securities held to maturity, amortized cost, over 1 to 5 years 6,287  
Investment securities held to maturity, amortized cost, over 5 to 10 years 116,637  
Investment securities held to maturity, amortized cost, over 10 years 100,074  
Investment securities held to maturity, amortized cost, subtotal 225,753  
Collateralized Mortgage-Backed Securities [Member]    
Less than 1 Year 13,689  
1 Year - 5 Years 84,660  
5 Years - 10 Years 119,303  
More than 10 Years 9,017  
Fair Value, available for sale 226,669 $ 433,115
Investment securities held to maturity, amortized cost, 1 year or less 3,511  
Investment securities held to maturity, amortized cost, over 1 to 5 years 44,972  
Investment securities held to maturity, amortized cost, over 5 to 10 years 155,682  
Investment securities held to maturity, amortized cost, over 10 years 0  
Investment securities held to maturity, amortized cost, subtotal 204,165  
Equity Securities [Member]    
Less than 1 Year 0  
1 Year - 5 Years 1,000  
5 Years - 10 Years 0  
More than 10 Years 7,282  
Investment securities held to maturity, amortized cost, 1 year or less 0  
Investment securities held to maturity, amortized cost, over 1 to 5 years 0  
Investment securities held to maturity, amortized cost, over 5 to 10 years 0  
Investment securities held to maturity, amortized cost, over 10 years 0  
Investment securities held to maturity, amortized cost, subtotal $ 0