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Note 2 - Securities - Investments in an Unrealized Loss Position That Were Temporarily Impaired (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Less than 12 months, fair value, available for sale securities $ 174,217 $ 18,387
Less than 12 months, unrealized (loss), available for sale securities (2,085) (82)
12 months or more, fair value, available for sale securities 15,758 0
12 months or more, unrealized (loss), available for sale securities (511) 0
Total, fair value, available for sale securities 189,975 18,387
Total, unrealized (loss), available for sale securities (2,596) (82)
Less than 12 months, fair value, held to maturity securities 6,410  
Less than 12 months, fair value, held to maturity securities (66)  
12 months or more, fair value, held to maturity securities 0  
12 months or more, unrealized (loss), available for sale securities 0  
Total, fair value, held to maturity securities 6,410  
Total, unrealized (loss), held to maturity securities (66)  
Less than 12 months, fair value 180,627  
Less than 12 months, fair value, (2,151)  
12 months or more, fair value 15,758  
12 months or more, unrealized (loss) (511)  
Total, fair value 196,385  
Total, unrealized (loss) (2,662)  
US Treasury Securities [Member]    
Less than 12 months, fair value, available for sale securities 29,656  
Less than 12 months, unrealized (loss), available for sale securities (250)  
12 months or more, fair value, available for sale securities 0  
12 months or more, unrealized (loss), available for sale securities 0  
Total, fair value, available for sale securities 29,656  
Total, unrealized (loss), available for sale securities (250)  
US Agency and Mortgage-backed Securities [Member]    
Less than 12 months, fair value, available for sale securities 109,950 17,367
Less than 12 months, unrealized (loss), available for sale securities (1,335) (80)
12 months or more, fair value, available for sale securities 14,749 0
12 months or more, unrealized (loss), available for sale securities (502) 0
Total, fair value, available for sale securities 124,699 17,367
Total, unrealized (loss), available for sale securities (1,837) (80)
Less than 12 months, fair value, held to maturity securities 5,411  
Less than 12 months, fair value, held to maturity securities (53)  
12 months or more, fair value, held to maturity securities 0  
12 months or more, unrealized (loss), available for sale securities 0  
Total, fair value, held to maturity securities 5,411  
Total, unrealized (loss), held to maturity securities (53)  
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 34,611 1,020
Less than 12 months, unrealized (loss), available for sale securities (500) (2)
12 months or more, fair value, available for sale securities 1,009 0
12 months or more, unrealized (loss), available for sale securities (9) 0
Total, fair value, available for sale securities 35,620 1,020
Total, unrealized (loss), available for sale securities (509) $ (2)
Less than 12 months, fair value, held to maturity securities 999  
Less than 12 months, fair value, held to maturity securities (13)  
12 months or more, fair value, held to maturity securities 0  
12 months or more, unrealized (loss), available for sale securities 0  
Total, fair value, held to maturity securities 999  
Total, unrealized (loss), held to maturity securities $ (13)