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Note 5 - Debt Securities - Summary of Volume of State and Political Subdivision Securities Held in Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt securities, available for sale, amortized cost $ 435,376 $ 398,643
Available for sale securities, unrealized gains 180 6,223
Available for sale securities, unrealized losses 51,591 3,763
Debt securities available for sale (at fair value) 383,965 $ 401,103 [1]
CALIFORNIA    
Debt securities, available for sale, amortized cost 47,597  
Available for sale securities, unrealized gains 0  
Available for sale securities, unrealized losses 10,650  
Debt securities available for sale (at fair value) 36,947  
TEXAS    
Debt securities, available for sale, amortized cost 35,726  
Available for sale securities, unrealized gains 0  
Available for sale securities, unrealized losses 5,621  
Debt securities available for sale (at fair value) 30,105  
WASHINGTON    
Debt securities, available for sale, amortized cost 20,736  
Available for sale securities, unrealized gains 0  
Available for sale securities, unrealized losses 2,286  
Debt securities available for sale (at fair value) 18,450  
MICHIGAN    
Debt securities, available for sale, amortized cost 21,440  
Available for sale securities, unrealized gains 0  
Available for sale securities, unrealized losses 3,099  
Debt securities available for sale (at fair value) 18,341  
OREGON    
Debt securities, available for sale, amortized cost 15,766  
Available for sale securities, unrealized gains 0  
Available for sale securities, unrealized losses 3,997  
Debt securities available for sale (at fair value) $ 11,769  
[1] Derived from audited consolidated financial statements