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Note 2 - Securities - Investments in an Unrealized Loss Position That Were Temporarily Impaired (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Less than 12 months, fair value, available for sale securities $ 229,850 $ 174,217
Less than 12 months, unrealized (loss), available for sale securities (15,412) (2,085)
12 months or more, fair value, available for sale securities 31,539 15,758
12 months or more, unrealized (loss), available for sale securities (3,469) (511)
Total, fair value, available for sale securities 261,389 189,975
Total, unrealized (loss), available for sale securities (18,881) (2,596)
12 months or more, fair value, available for sale securities 31,539 15,758
Less than 12 months, fair value, held to maturity securities   6,410
Less than 12 months, fair value, held to maturity securities (3,355) (66)
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 72,546 6,410
Total, unrealized (loss), held to maturity securities (3,355) (66)
Less than 12 months, fair value 302,396 180,627
Less than 12 months, fair value, (18,767) (2,151)
12 months or more, fair value 31,539 15,758
12 months or more, unrealized (loss) (3,469) (511)
Total, fair value 333,935 196,385
Total, unrealized (loss) (22,236) (2,662)
12 months or more, fair value, available for sale securities (31,539) (15,758)
US Treasury Securities [Member]    
Less than 12 months, fair value, available for sale securities 57,521 29,656
Less than 12 months, unrealized (loss), available for sale securities (2,276) (250)
12 months or more, fair value, available for sale securities 0 0
12 months or more, unrealized (loss), available for sale securities 0  
Total, fair value, available for sale securities 57,521 29,656
Total, unrealized (loss), available for sale securities (2,276) (250)
12 months or more, fair value, available for sale securities 0 0
12 months or more, fair value, available for sale securities 0 0
US Agency and Mortgage-backed Securities [Member]    
Less than 12 months, fair value, available for sale securities 126,499 109,950
Less than 12 months, unrealized (loss), available for sale securities (7,605) (1,335)
12 months or more, fair value, available for sale securities 26,536 14,749
12 months or more, unrealized (loss), available for sale securities (2,787) (502)
Total, fair value, available for sale securities 153,035 124,699
Total, unrealized (loss), available for sale securities (10,392) (1,837)
12 months or more, fair value, available for sale securities 26,536 14,749
Less than 12 months, fair value, held to maturity securities 66,555 5,411
Less than 12 months, fair value, held to maturity securities (2,812) (53)
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 66,555 5,411
Total, unrealized (loss), held to maturity securities (2,812) (53)
12 months or more, fair value, available for sale securities (26,536) (14,749)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 43,821 34,611
Less than 12 months, unrealized (loss), available for sale securities (5,529) (500)
12 months or more, fair value, available for sale securities 5,003 1,009
12 months or more, unrealized (loss), available for sale securities (682) (9)
Total, fair value, available for sale securities 48,824 35,620
Total, unrealized (loss), available for sale securities (6,211) (509)
12 months or more, fair value, available for sale securities 5,003 1,009
Less than 12 months, fair value, held to maturity securities 5,991 999
Less than 12 months, fair value, held to maturity securities (543) (13)
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 5,991 999
Total, unrealized (loss), held to maturity securities (543) (13)
12 months or more, fair value, available for sale securities (5,003) $ (1,009)
Corporate Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 2,009  
Less than 12 months, unrealized (loss), available for sale securities (2)  
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 2,009  
Total, unrealized (loss), available for sale securities (2)  
12 months or more, fair value, available for sale securities 0  
Less than 12 months, fair value, held to maturity securities 72,546  
12 months or more, fair value, available for sale securities $ 0