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Note 2 - Securities - Schedule of Maturities of Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Less than 1 Year $ 28,971  
1 Year - 5 Years 116,877  
5 Years - 10 Years 209,800  
More than 10 Years 174,445  
Fair Value, available for sale 530,093 $ 1,098,885
Total Available for Sale 530,093  
Investment securities held to maturity, amortized cost, 1 year or less 2,348  
Investment securities held to maturity, amortized cost, over 1 to 5 years 62,569  
Investment securities held to maturity, amortized cost, over 5 to 10 years 235,857  
Investment securities held to maturity, amortized cost, over 10 years 127,431  
Investment securities held to maturity, amortized cost, subtotal 428,205  
US Treasury Securities [Member]    
Less than 1 Year 0  
1 Year - 5 Years 0  
5 Years - 10 Years 77,554  
More than 10 Years 0  
Fair Value, available for sale 77,554 91,979
US Treasury and Government [Member]    
Fair Value, available for sale 2,550 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 2,965  
Investment securities held to maturity, amortized cost, over 10 years 0  
Investment securities held to maturity, amortized cost, subtotal 2,965  
US States and Political Subdivisions Debt Securities [Member]    
Less than 1 Year 9,609  
1 Year - 5 Years 7,929  
5 Years - 10 Years 38,202  
More than 10 Years 168,247  
Fair Value, available for sale 223,987 534,847
Investment securities held to maturity, amortized cost, 1 year or less 2,348  
Investment securities held to maturity, amortized cost, over 1 to 5 years 5,180  
Investment securities held to maturity, amortized cost, over 5 to 10 years 68,447  
Investment securities held to maturity, amortized cost, over 10 years 126,431  
Investment securities held to maturity, amortized cost, subtotal 202,406  
Corporate Debt Securities [Member]    
Less than 1 Year 0  
1 Year - 5 Years 497  
5 Years - 10 Years 219  
More than 10 Years 0  
Fair Value, available for sale 716 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 18,347  
Investment securities held to maturity, amortized cost, over 10 years 1,000  
Investment securities held to maturity, amortized cost, subtotal 19,597  
Asset-Backed Securities [Member]    
Less than 1 Year 0  
1 Year - 5 Years 9,481  
5 Years - 10 Years 3,664  
More than 10 Years 0  
Fair Value, available for sale 13,145 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 1,106  
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 1,106  
Debt Securities [Member]    
Less than 1 Year 9,609  
1 Year - 5 Years 17,907  
5 Years - 10 Years 119,639  
More than 10 Years 168,247  
Fair Value, available for sale 315,402  
Investment securities held to maturity, amortized cost, 1 year or less 2,348  
Investment securities held to maturity, amortized cost, over 1 to 5 years 6,536  
Investment securities held to maturity, amortized cost, over 5 to 10 years 89,759  
Investment securities held to maturity, amortized cost, over 10 years 127,431  
Investment securities held to maturity, amortized cost, subtotal 226,074  
Collateralized Mortgage-Backed Securities [Member]    
Less than 1 Year 19,362  
1 Year - 5 Years 98,970  
5 Years - 10 Years 90,161  
More than 10 Years 6,198  
Fair Value, available for sale 214,691 $ 433,115
Investment securities held to maturity, amortized cost, 1 year or less 0  
Investment securities held to maturity, amortized cost, over 1 to 5 years 56,033  
Investment securities held to maturity, amortized cost, over 5 to 10 years 146,098  
Investment securities held to maturity, amortized cost, over 10 years 0  
Investment securities held to maturity, amortized cost, subtotal $ 202,131