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Note 3 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Securities available-for-sale, amortized costs	$ 705,189	$ 759,917
Securities available-for-sale, gross unrealized gains	0	87
Securities available-for-sale, gross unrealized losses	91,011	103,152
Securities available for sale, allowance for credit loss	0
Securities available for sale	614,178	656,852
US Treasury Securities [Member]
Securities available-for-sale, amortized costs	994	992
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	54	56
Securities available for sale, allowance for credit loss	0
Securities available for sale	940	936
US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized costs	353,788	391,538
Securities available-for-sale, gross unrealized gains	0	39
Securities available-for-sale, gross unrealized losses	48,887	55,002
Securities available for sale, allowance for credit loss	0
Securities available for sale	304,901	336,575
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized costs	179,889	190,192
Securities available-for-sale, gross unrealized gains	0	26
Securities available-for-sale, gross unrealized losses	32,743	38,018
Securities available for sale, allowance for credit loss	0
Securities available for sale	147,146	152,200
Collateralized Mortgage-Backed Securities [Member]
Securities available-for-sale, amortized costs	164,015	170,694
Securities available-for-sale, gross unrealized gains	0	22
Securities available-for-sale, gross unrealized losses	8,427	9,239
Securities available for sale, allowance for credit loss	0
Securities available for sale	155,588	161,477
Corporate Debt Securities [Member]
Securities available-for-sale, amortized costs	6,503	6,501
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	900	837
Securities available for sale, allowance for credit loss	0
Securities available for sale	$ 5,603	$ 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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+ References

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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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