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Note 2 - Securities - Schedule of Maturities of Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Less than 1 Year $ 30,002  
1 Year - 5 Years 163,024  
5 years to 10 years 559,739  
More than 10 Years 111,195  
Fair Value 855,555 $ 574,787
Equity securities 8,405 2,896
Fair value 863,960 577,683
US Treasury and Government [Member]    
Less than 1 Year 2,030  
1 Year - 5 Years 0  
5 years to 10 years 0  
More than 10 Years 0  
Fair Value $ 2,030 2,051
Less than 1 year, weighted average yield 1.98%  
1 year to 5 years, weighted average yield 0.00%  
5 years to 10 years , weighted average yields 0.00%  
More than 10 years , weighted average yields 0.00%  
Weighted average yields, total 1.98%  
US Treasury Securities [Member]    
Less than 1 Year $ 0  
1 Year - 5 Years 2,040  
5 years to 10 years 35,321  
More than 10 Years 0  
Fair Value $ 37,361 2,056
Less than 1 year, weighted average yield 0.00%  
1 year to 5 years, weighted average yield 1.85%  
5 years to 10 years , weighted average yields 1.24%  
More than 10 years , weighted average yields 0.00%  
Weighted average yields, total 1.27%  
US States and Political Subdivisions Debt Securities [Member]    
Less than 1 Year $ 14,546  
1 Year - 5 Years 59,291  
5 years to 10 years 317,995  
More than 10 Years 95,609  
Fair Value $ 487,441 320,368
Less than 1 year, weighted average yield 3.12%  
1 year to 5 years, weighted average yield 2.88%  
5 years to 10 years , weighted average yields 2.51%  
More than 10 years , weighted average yields 2.33%  
Weighted average yields, total 2.54%  
Corporate Debt Securities [Member]    
Less than 1 Year $ 502  
1 Year - 5 Years 1,040  
5 years to 10 years 5,800  
More than 10 Years 1,000  
Fair Value $ 8,342 3,589
Less than 1 year, weighted average yield 2.57%  
1 year to 5 years, weighted average yield 2.86%  
5 years to 10 years , weighted average yields 3.70%  
More than 10 years , weighted average yields 3.75%  
Weighted average yields, total 3.75%  
Asset-backed Securities [Member]    
Less than 1 Year $ 0  
1 Year - 5 Years 2,068  
5 years to 10 years  
More than 10 Years  
Fair Value $ 2,068 0
Less than 1 year, weighted average yield 0.00%  
1 year to 5 years, weighted average yield 0.94%  
5 years to 10 years , weighted average yields 0.00%  
More than 10 years , weighted average yields 0.00%  
Weighted average yields, total 0.94%  
Collateralized Mortgage Backed Securities [Member]    
Less than 1 Year $ 12,924  
1 Year - 5 Years 97,585  
5 years to 10 years 200,623  
More than 10 Years 7,181  
Fair Value 318,313 246,723
Equity securities $ 8,405  
Less than 1 year, weighted average yield 1.78%  
1 year to 5 years, weighted average yield 1.83%  
5 years to 10 years , weighted average yields 1.26%  
More than 10 years , weighted average yields 1.74%  
Weighted average yields, total 1.47%  
Debt [Member]    
Less than 1 Year $ 17,078  
1 Year - 5 Years 64,439  
5 years to 10 years 359,116  
More than 10 Years 96,609  
Fair Value 537,242 328,064
Equity Securities [Member]    
Less than 1 Year 0  
1 Year - 5 Years 1,000  
5 years to 10 years 0  
More than 10 Years $ 7,405  
Equity securities   $ 2,896
Less than 1 year, weighted average yield 0.00%  
1 year to 5 years, weighted average yield 4.66%  
5 years to 10 years , weighted average yields 0.00%  
More than 10 years , weighted average yields 0.00%  
Weighted average yields, total 0.55%