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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) |

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