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Note 3 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities available-for-sale, amortized costs	$ 702,083	$ 759,917
Securities available-for-sale, gross unrealized gains	0	87
Securities available-for-sale, gross unrealized losses	110,531	103,152
Securities available for sale, allowance for credit loss	0
Securities available for sale	591,552	656,852
US Treasury Securities [Member]
Securities available-for-sale, amortized costs	995	992
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	47	56
Securities available for sale, allowance for credit loss	0
Securities available for sale	948	936
US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized costs	353,845	391,538
Securities available-for-sale, gross unrealized gains	0	39
Securities available-for-sale, gross unrealized losses	57,856	55,002
Securities available for sale, allowance for credit loss	0
Securities available for sale	295,989	336,575
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized costs	179,672	190,192
Securities available-for-sale, gross unrealized gains	0	26
Securities available-for-sale, gross unrealized losses	42,603	38,018
Securities available for sale, allowance for credit loss	0
Securities available for sale	137,069	152,200
Collateralized Mortgage-Backed Securities [Member]
Securities available-for-sale, amortized costs	161,067	170,694
Securities available-for-sale, gross unrealized gains	0	22
Securities available-for-sale, gross unrealized losses	8,955	9,239
Securities available for sale, allowance for credit loss	0
Securities available for sale	152,112	161,477
Corporate Debt Securities [Member]
Securities available-for-sale, amortized costs	6,504	6,501
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	1,070	837
Securities available for sale, allowance for credit loss	0
Securities available for sale	$ 5,434	$ 5,664

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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