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Note 3 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Amortized cost	$ 703,509		$ 721,799
Gross unrealized gains	189		289
Gross unrealized losses		$ (90,879)	(87,204)
Securities available-for-sale	612,819	612,819	634,884
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0	0
US Government Agencies Debt Securities [Member]
Amortized cost	54,102		54,889
Gross unrealized gains	0		0
Gross unrealized losses		(10,949)	(10,439)
Securities available-for-sale		43,153	44,450
Debt Securities, Available-for-Sale, Allowance for Credit Loss		0	0
Residential Mortgage-Backed Securities [Member]
Amortized cost	465,856		475,263
Gross unrealized gains	80		178
Gross unrealized losses		(56,810)	(57,863)
Securities available-for-sale		409,126	417,578
Debt Securities, Available-for-Sale, Allowance for Credit Loss		0	0
Commercial Mortgage-Backed Securities [Member]
Amortized cost	25,364		25,485
Gross unrealized gains	0		0
Gross unrealized losses		(4,154)	(4,381)
Securities available-for-sale		21,210	21,104
Debt Securities, Available-for-Sale, Allowance for Credit Loss		0	0
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	152,614		157,247
Gross unrealized gains	109		111
Gross unrealized losses		(18,884)	(14,462)
Securities available-for-sale		133,839	142,896
Debt Securities, Available-for-Sale, Allowance for Credit Loss		0	0
Corporate Debt Securities [Member]
Amortized cost	4,000		7,000
Gross unrealized gains	0		0
Gross unrealized losses		(41)	(26)
Securities available-for-sale		3,959	6,974
Debt Securities, Available-for-Sale, Allowance for Credit Loss		0	0
Asset-Backed Securities [Member]
Amortized cost	1,422		1,673
Gross unrealized gains	0		0
Gross unrealized losses		(41)	(33)
Securities available-for-sale		1,381	1,640
Debt Securities, Available-for-Sale, Allowance for Credit Loss		0	0
Other Debt Obligations [Member]
Amortized cost	151		242
Gross unrealized gains	$ 0		0
Gross unrealized losses		0	0
Securities available-for-sale		151	242
Debt Securities, Available-for-Sale, Allowance for Credit Loss		$ 0	$ 0

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
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-Publisher FASB
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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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+ References

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-Topic 320
-SubTopic 10
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-Topic 942
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-Publisher FASB
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