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Note 2 - Securities - Schedule of Maturities of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Less than 1 Year $ 18,985  
1 Year - 5 Years 138,261  
5 years to 10 years 442,171  
More than 10 Years 127,014  
Fair Value 722,627 $ 574,787
Equity securities 3,804 2,896
Fair value $ 726,431 577,683
Less than 1 year, weighted average yield 0.00%  
1 year to 5 years, weighted average yield 4.61%  
5 years to 10 years , weighted average yields 0.00%  
More than 10 years , weighted average yields 0.00%  
Weighted average yields, total 1.21%  
US Treasury and Government [Member]    
Less than 1 Year $ 2,041  
1 Year - 5 Years 0  
5 years to 10 years 0  
More than 10 Years 0  
Fair Value $ 2,041 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 2,048  
5 years to 10 years 9,816  
More than 10 Years 0  
Fair Value $ 11,864 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 0.00%  
More than 10 years , weighted average yields 0.00%  
Weighted average yields, total 1.30%  
US States and Political Subdivisions Debt Securities [Member]    
Less than 1 Year $ 13,224  
1 Year - 5 Years 56,492  
5 years to 10 years 245,466  
More than 10 Years 116,293  
Fair Value $ 431,475 320,368
Less than 1 year, weighted average yield 3.02%  
1 year to 5 years, weighted average yield 2.88%  
5 years to 10 years , weighted average yields 2.57%  
More than 10 years , weighted average yields 2.34%  
Weighted average yields, total 2.56%  
Trust Preferred Securities [Member]    
Less than 1 Year $ 0  
1 Year - 5 Years 0  
5 years to 10 years 0  
More than 10 Years 1,000  
Fair Value $ 1,000 1,000
Less than 1 year, weighted average yield 2.63%  
1 year to 5 years, weighted average yield 2.86%  
5 years to 10 years , weighted average yields 0.00%  
More than 10 years , weighted average yields 0.00%  
Weighted average yields, total 2.75%  
Corporate Debt Securities [Member]    
Less than 1 Year $ 958  
1 Year - 5 Years 1,032  
5 years to 10 years 0  
More than 10 Years 0  
Fair Value 1,990 2,589
Collateralized Mortgage Backed Securities [Member]    
Less than 1 Year 2,762  
1 Year - 5 Years 75,355  
5 years to 10 years 186,889  
More than 10 Years 6,917  
Fair Value 271,923 246,723
Equity securities $ 3,804  
Less than 1 year, weighted average yield 0.00%  
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 3.75%  
Asset-backed Securities [Member]    
Less than 1 Year $ 0  
1 Year - 5 Years 2,334  
5 years to 10 years  
More than 10 Years  
Fair Value $ 2,334 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%  
Equity Securities [Member]    
Less than 1 Year $ 0  
1 Year - 5 Years 1,000  
5 years to 10 years 0  
More than 10 Years $ 2,804  
Equity securities   2,896
Less than 1 year, weighted average yield 4.94%  
1 year to 5 years, weighted average yield 1.81%  
5 years to 10 years , weighted average yields 1.09%  
More than 10 years , weighted average yields 1.73%  
Weighted average yields, total 1.35%  
Debt [Member]    
Less than 1 Year $ 16,223  
1 Year - 5 Years 61,906  
5 years to 10 years 255,282  
More than 10 Years 117,293  
Fair Value $ 450,704 $ 328,064