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Note 3 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized cost	$ 704,842	$ 721,799
Gross unrealized gains	0	289
Gross unrealized losses	(122,975)	(87,204)
Securities available-for-sale	581,867	634,884
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
US Government Agencies Debt Securities [Member]
Amortized cost	57,243	54,889
Gross unrealized gains	0	0
Gross unrealized losses	(13,274)	(10,439)
Securities available-for-sale	43,969	44,450
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Residential Mortgage-Backed Securities [Member]
Amortized cost	466,362	475,263
Gross unrealized gains	0	178
Gross unrealized losses	(76,935)	(57,863)
Securities available-for-sale	389,427	417,578
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Commercial Mortgage-Backed Securities [Member]
Amortized cost	25,303	25,485
Gross unrealized gains	0	0
Gross unrealized losses	(5,376)	(4,381)
Securities available-for-sale	19,927	21,104
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	150,218	157,247
Gross unrealized gains	0	111
Gross unrealized losses	(27,319)	(14,462)
Securities available-for-sale	122,899	142,896
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Corporate Debt Securities [Member]
Amortized cost	3,000	7,000
Gross unrealized gains	0	0
Gross unrealized losses	(39)	(26)
Securities available-for-sale	2,961	6,974
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Asset-Backed Securities [Member]
Amortized cost	1,354	1,673
Gross unrealized gains	0	0
Gross unrealized losses	(32)	(33)
Securities available-for-sale	1,322	1,640
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Other Debt Obligations [Member]
Amortized cost	1,362	242
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Securities available-for-sale	1,362	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
-Topic 944
-SubTopic 210
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