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Note 2 - Securities - Investments in an Unrealized Loss Position That Were Temporarily Impaired (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Less than 12 months, fair value, available for sale securities	$ 5,750	$ 61,012
Less than 12 months, unrealized (loss), available for sale securities	(244)	(5,458)
12 months or more, fair value, available for sale securities	137,254	90,892
12 months or more, unrealized (loss), available for sale securities	(20,418)	(18,560)
Total, fair value, available for sale securities	143,004	151,904
Total, unrealized (loss), available for sale securities	(20,662)	(24,018)
Less than 12 months, fair value, held to maturity securities		88,617
Less than 12 months, fair value, held to maturity securities		(8,466)
12 months or more, fair value, held to maturity securities		53,181
12 months or more, unrealized (loss), available for sale securities		(2,895)
Total, fair value, held to maturity securities		141,798
Total, unrealized (loss), held to maturity securities		(11,361)
Less than 12 months, fair value		149,629
Less than 12 months, accumulated loss		(13,924)
12 months or more, fair value		144,073
12 months or more, unrealized (loss)		(21,455)
Total, fair value		293,702
Total, unrealized (loss)		(35,379)
US Treasury Securities [Member]
Less than 12 months, fair value, available for sale securities	0	9,041
Less than 12 months, unrealized (loss), available for sale securities	0	(932)
12 months or more, fair value, available for sale securities	11,450	2,188
12 months or more, unrealized (loss), available for sale securities	(1,026)	(307)
Total, fair value, available for sale securities	11,450	11,229
Total, unrealized (loss), available for sale securities	(1,026)	(1,239)
Less than 12 months, fair value, held to maturity securities		19,302
Less than 12 months, fair value, held to maturity securities		(258)
12 months or more, fair value, held to maturity securities		18,342
12 months or more, unrealized (loss), available for sale securities		(310)
Total, fair value, held to maturity securities		37,644
Total, unrealized (loss), held to maturity securities		(568)
US Agency and Mortgage-backed Securities [Member]
Less than 12 months, fair value, available for sale securities	1,281	27,282
Less than 12 months, unrealized (loss), available for sale securities	(29)	(1,945)
12 months or more, fair value, available for sale securities	78,800	62,342
12 months or more, unrealized (loss), available for sale securities	(12,163)	(11,204)
Total, fair value, available for sale securities	80,081	89,624
Total, unrealized (loss), available for sale securities	(12,192)	(13,149)
Less than 12 months, fair value, held to maturity securities		58,019
Less than 12 months, fair value, held to maturity securities		(6,848)
12 months or more, fair value, held to maturity securities		32,167
12 months or more, unrealized (loss), available for sale securities		(2,341)
Total, fair value, held to maturity securities		90,186
Total, unrealized (loss), held to maturity securities		(9,189)
US States and Political Subdivisions Debt Securities [Member]
Less than 12 months, fair value, available for sale securities	4,469	24,689
Less than 12 months, unrealized (loss), available for sale securities	(215)	(2,581)
12 months or more, fair value, available for sale securities	47,004	26,362
12 months or more, unrealized (loss), available for sale securities	(7,229)	(7,049)
Total, fair value, available for sale securities	51,473	51,051
Total, unrealized (loss), available for sale securities	$ (7,444)	(9,630)
Less than 12 months, fair value, held to maturity securities		8,648
Less than 12 months, fair value, held to maturity securities		(1,008)
12 months or more, fair value, held to maturity securities		2,672
12 months or more, unrealized (loss), available for sale securities		(244)
Total, fair value, held to maturity securities		11,320
Total, unrealized (loss), held to maturity securities		(1,252)
Corporate Debt Securities [Member]
Less than 12 months, fair value, held to maturity securities		2,648
Less than 12 months, fair value, held to maturity securities		(352)
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		2,648
Total, unrealized (loss), held to maturity securities		$ (352)

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