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Note 3 - Securities - Securities With Unrealized Losses (Details) $ in Thousands	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Count, less than 12 months	16	2
Fair value, less than 12 months	$ 125,440	$ 8,987
Unrealized loss, less than 12 months	$ (160)	$ (13)
Count, 12 months or more	135	198
Fair value, 12 months or more	$ 86,423	$ 134,306
Unrealized loss, 12 months or more	$ (2,201)	$ (3,580)
Count, total	151	200
Fair value, total	$ 211,863	$ 143,293
Unrealized loss, total	$ (2,361)	$ (3,593)
US States and Political Subdivisions Debt Securities [Member]
Count, less than 12 months	1	0
Fair value, less than 12 months	$ 603	$ 0
Unrealized loss, less than 12 months	$ (1)	$ 0
Count, 12 months or more	1	1
Fair value, 12 months or more	$ 221	$ 217
Unrealized loss, 12 months or more	$ (3)	$ (8)
Count, total	2	1
Fair value, total	$ 824	$ 217
Unrealized loss, total	$ (4)	$ (8)
US Treasury Securities [Member]
Count, less than 12 months	0	0
Fair value, less than 12 months	$ 0	$ 0
Unrealized loss, less than 12 months	$ 0	$ 0
Count, 12 months or more	115	170
Fair value, 12 months or more	$ 75,059	$ 112,508
Unrealized loss, 12 months or more	$ (2,069)	$ (3,412)
Count, total	115	170
Fair value, total	$ 75,059	$ 112,508
Unrealized loss, total	$ (2,069)	$ (3,412)
US Government-sponsored Enterprises Debt Securities [Member]
Count, less than 12 months	15	2
Fair value, less than 12 months	$ 124,837	$ 8,987
Unrealized loss, less than 12 months	$ (159)	$ (13)
Count, 12 months or more	2	4
Fair value, 12 months or more	$ 7,985	$ 17,951
Unrealized loss, 12 months or more	$ (15)	$ (49)
Count, total	17	6
Fair value, total	$ 132,822	$ 26,938
Unrealized loss, total	$ (174)	$ (62)
Residential Mortgage-Backed Securities [Member]
Count, less than 12 months	0	0
Fair value, less than 12 months	$ 0	$ 0
Unrealized loss, less than 12 months	$ 0	$ 0
Count, 12 months or more	12	17
Fair value, 12 months or more	$ 2,236	$ 2,627
Unrealized loss, 12 months or more	$ (98)	$ (91)
Count, total	12	17
Fair value, total	$ 2,236	$ 2,627
Unrealized loss, total	$ (98)	$ (91)
Collateralized Mortgage-Backed Securities [Member]
Count, less than 12 months	0	0
Fair value, less than 12 months	$ 0	$ 0
Unrealized loss, less than 12 months	$ 0	$ 0
Count, 12 months or more	5	6
Fair value, 12 months or more	$ 922	$ 1,003
Unrealized loss, 12 months or more	$ (16)	$ (20)
Count, total	5	6
Fair value, total	$ 922	$ 1,003
Unrealized loss, total	$ (16)	$ (20)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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