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Note 2 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Number of investment positions - less than twelve months 96 16
Fair value - less than twelve months $ 196,654 $ 13,489
Gross unrealized losses - less than twelve months $ 1,388 $ 25
Number of investment positions - more than twelve months 1 4
Fair value - more than twelve months $ 2,961 $ 1,589
Gross unrealized losses - more than twelve months $ 39 $ 12
Number of investment positions 97 20
Fair value $ 199,615 $ 15,078
Gross unrealized losses $ 1,427 $ 37
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Number of investment positions - less than twelve months 14  
Fair value - less than twelve months $ 38,783  
Gross unrealized losses - less than twelve months $ 179  
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months 4 12
Fair value - less than twelve months $ 277 $ 6,189
Gross unrealized losses - less than twelve months $ 1 $ 18
Number of investment positions - more than twelve months   4
Fair value - more than twelve months   $ 1,589
Gross unrealized losses - more than twelve months   $ 12
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months 32 2
Fair value - less than twelve months $ 89,959 $ 5,997
Gross unrealized losses - less than twelve months $ 743 $ 3
Number of investment positions - more than twelve months 1  
Fair value - more than twelve months $ 2,961  
Gross unrealized losses - more than twelve months $ 39  
US States and Political Subdivisions Debt Securities [Member]    
Number of investment positions - less than twelve months 38 2
Fair value - less than twelve months $ 27,107 $ 1,303
Gross unrealized losses - less than twelve months $ 384 $ 4
US Treasury and Government [Member]    
Number of investment positions - less than twelve months 8  
Fair value - less than twelve months $ 40,528  
Gross unrealized losses - less than twelve months $ 81