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Note 2 - Securities - Investments in an Unrealized Loss Position That Were Temporarily Impaired (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Less than 12 months, fair value, available for sale securities $ 83,766 $ 174,217
Less than 12 months, unrealized (loss), available for sale securities (11,073) (2,085)
12 months or more, fair value, available for sale securities 81,220 15,758
12 months or more, unrealized (loss), available for sale securities (19,272) (511)
Total, fair value, available for sale securities 164,986 189,975
Total, unrealized (loss), available for sale securities (30,345) (2,596)
Less than 12 months, fair value, held to maturity securities 109,060 6,410
Less than 12 months, fair value, held to maturity securities (8,850) (66)
12 months or more, fair value, held to maturity securities 28,855 0
12 months or more, unrealized (loss), available for sale securities (3,124) 0
Total, fair value, held to maturity securities 137,915 6,410
Total, unrealized (loss), held to maturity securities (11,974) (66)
Less than 12 months, fair value 192,826 180,627
Less than 12 months, fair value, (19,923) (2,151)
12 months or more, fair value 110,075 15,758
12 months or more, unrealized (loss) (22,396) (511)
Total, fair value 302,901 196,385
Total, unrealized (loss) (42,319) (2,662)
12 months or more, fair value, available for sale securities 81,220 15,758
US Treasury Securities [Member]    
Less than 12 months, fair value, available for sale securities 17,531 29,656
Less than 12 months, unrealized (loss), available for sale securities (2,422) (250)
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 17,531 29,656
Total, unrealized (loss), available for sale securities (2,422) (250)
Less than 12 months, fair value, held to maturity securities 28,517  
Less than 12 months, fair value, held to maturity securities (395)  
12 months or more, fair value, held to maturity securities 8,839  
12 months or more, unrealized (loss), available for sale securities (243)  
Total, fair value, held to maturity securities 37,356  
Total, unrealized (loss), held to maturity securities (638)  
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 33,107 109,950
Less than 12 months, unrealized (loss), available for sale securities (2,596) (1,335)
12 months or more, fair value, available for sale securities 64,184 14,749
12 months or more, unrealized (loss), available for sale securities (13,404) (502)
Total, fair value, available for sale securities 97,291 124,699
Total, unrealized (loss), available for sale securities (16,000) (1,837)
Less than 12 months, fair value, held to maturity securities 68,723 5,411
Less than 12 months, fair value, held to maturity securities (6,595) (53)
12 months or more, fair value, held to maturity securities 18,242 0
12 months or more, unrealized (loss), available for sale securities (2,756) 0
Total, fair value, held to maturity securities 86,965 5,411
Total, unrealized (loss), held to maturity securities (9,351) (53)
12 months or more, fair value, available for sale securities 64,184 14,749
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 33,128 34,611
Less than 12 months, unrealized (loss), available for sale securities (6,055) (500)
12 months or more, fair value, available for sale securities 17,036 1,009
12 months or more, unrealized (loss), available for sale securities (5,868) (9)
Total, fair value, available for sale securities 50,164 35,620
Total, unrealized (loss), available for sale securities (11,923) (509)
Less than 12 months, fair value, held to maturity securities 9,104 999
Less than 12 months, fair value, held to maturity securities (1,576) (13)
12 months or more, fair value, held to maturity securities 1,774 0
12 months or more, unrealized (loss), available for sale securities (125) 0
Total, fair value, held to maturity securities 10,878 999
Total, unrealized (loss), held to maturity securities (1,701) (13)
12 months or more, fair value, available for sale securities 17,036 $ 1,009
Corporate Debt Securities [Member]    
Less than 12 months, fair value, held to maturity securities 2,716  
Less than 12 months, fair value, held to maturity securities (284)  
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 2,716  
Total, unrealized (loss), held to maturity securities $ (284)