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Note 2 - Securities - Investments in an Unrealized Loss Position That Were Temporarily Impaired (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Less than 12 months, fair value, available for sale securities $ 221,029 $ 174,217
Less than 12 months, unrealized (loss), available for sale securities (25,022) (2,085)
12 months or more, fair value, available for sale securities 30,722 15,758
12 months or more, unrealized (loss), available for sale securities (6,074) (511)
Total, fair value, available for sale securities 251,751 189,975
Total, unrealized (loss), available for sale securities (31,096) (2,596)
12 months or more, fair value, available for sale securities 30,722 15,758
Less than 12 months, fair value, held to maturity securities 69,582 6,410
Less than 12 months, fair value, held to maturity securities (6,661) (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 69,582 6,410
Total, unrealized (loss), held to maturity securities (6,661) (66)
Less than 12 months, fair value 290,611 180,627
Less than 12 months, fair value, (31,683) (2,151)
12 months or more, fair value 30,722 15,758
12 months or more, unrealized (loss) (6,074) (511)
Total, fair value 321,333 196,385
Total, unrealized (loss) (37,757) (2,662)
US Treasury Securities [Member]    
Less than 12 months, fair value, available for sale securities 56,256 29,656
Less than 12 months, unrealized (loss), available for sale securities (3,559) (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 56,256 29,656
Total, unrealized (loss), available for sale securities (3,559) (250)
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 114,629 109,950
Less than 12 months, unrealized (loss), available for sale securities (12,586) (1,335)
12 months or more, fair value, available for sale securities 24,426 14,749
12 months or more, unrealized (loss), available for sale securities (4,343) (502)
Total, fair value, available for sale securities 139,055 124,699
Total, unrealized (loss), available for sale securities (16,929) (1,837)
12 months or more, fair value, available for sale securities 24,426 14,749
Less than 12 months, fair value, held to maturity securities 59,902 5,411
Less than 12 months, fair value, held to maturity securities (5,400) (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 59,902 5,411
Total, unrealized (loss), held to maturity securities (5,400) (53)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 48,145 34,611
Less than 12 months, unrealized (loss), available for sale securities (8,873) (500)
12 months or more, fair value, available for sale securities 6,296 1,009
12 months or more, unrealized (loss), available for sale securities (1,731) (9)
Total, fair value, available for sale securities 54,441 35,620
Total, unrealized (loss), available for sale securities (10,604) (509)
12 months or more, fair value, available for sale securities 6,296 1,009
Less than 12 months, fair value, held to maturity securities 6,767 999
Less than 12 months, fair value, held to maturity securities (1,174) (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 6,767 999
Total, unrealized (loss), held to maturity securities (1,174) $ (13)
Corporate Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 1,999  
Less than 12 months, unrealized (loss), available for sale securities (4)  
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 1,999  
Total, unrealized (loss), available for sale securities (4)  
12 months or more, fair value, available for sale securities 0  
Less than 12 months, fair value, held to maturity securities 2,913  
Less than 12 months, fair value, held to maturity securities (87)  
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 2,913  
Total, unrealized (loss), held to maturity securities $ (87)