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Note 2 - Securities - Investments in an Unrealized Loss Position That Were Temporarily Impaired (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Less than 12 months, fair value, available for sale securities $ 145,767 $ 18,387
Less than 12 months, unrealized (loss), available for sale securities (1,650) (82)
12 months or more, fair value, available for sale securities 0 0
12 months or more, unrealized (loss), available for sale securities 0 0
Total, fair value, available for sale securities 145,767 18,387
Total, unrealized (loss), available for sale securities (1,650) (82)
Less than 12 months, fair value, held to maturity securities 0 0
Less than 12 months, fair value, held to maturity securities 0 0
12 months or more, fair value, held to maturity securities 0 0
12 months or more, unrealized (loss), available for sale securities 0 0
Total, fair value, held to maturity securities 0 0
Total, unrealized (loss), held to maturity securities 0 0
Less than 12 months, fair value 145,767 18,387
Less than 12 months, fair value, (1,650) (82)
12 months or more, fair value 0 0
12 months or more, unrealized (loss) 0 0
Total, fair value 145,767 18,387
Total, unrealized (loss) (1,650) (82)
US Treasury Securities [Member]    
Less than 12 months, fair value, available for sale securities 9,934  
Less than 12 months, unrealized (loss), available for sale securities (38)  
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 9,934  
Total, unrealized (loss), available for sale securities (38)  
US Agency and Mortgage-backed Securities [Member]    
Less than 12 months, fair value, available for sale securities 110,631 17,367
Less than 12 months, unrealized (loss), available for sale securities (1,234) (80)
12 months or more, fair value, available for sale securities 0 0
12 months or more, unrealized (loss), available for sale securities 0 0
Total, fair value, available for sale securities 110,631 17,367
Total, unrealized (loss), available for sale securities (1,234) (80)
Less than 12 months, fair value, held to maturity securities 0 0
Less than 12 months, fair value, held to maturity securities 0 0
12 months or more, fair value, held to maturity securities 0 0
12 months or more, unrealized (loss), available for sale securities 0 0
Total, fair value, held to maturity securities 0 0
Total, unrealized (loss), held to maturity securities 0 0
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 25,202 1,020
Less than 12 months, unrealized (loss), available for sale securities (378) (2)
12 months or more, fair value, available for sale securities 0 0
12 months or more, unrealized (loss), available for sale securities 0 0
Total, fair value, available for sale securities 25,202 1,020
Total, unrealized (loss), available for sale securities (378) (2)
Less than 12 months, fair value, held to maturity securities 0 0
Less than 12 months, fair value, held to maturity securities 0 0
12 months or more, fair value, held to maturity securities 0 0
12 months or more, unrealized (loss), available for sale securities 0 0
Total, fair value, held to maturity securities 0 0
Total, unrealized (loss), held to maturity securities $ 0 $ 0