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Note 2 - INVESTMENT SECURITIES - Summary of the fair value of investment securities pledged (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Aug. 31, 2025	Dec. 31, 2024	Aug. 31, 2024
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged securities held to maturity, at amortized cost	$ 954,115		$ 835,797
Assets pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	365,165		188,221
Pledged securities held to maturity, at amortized cost	200,283	$ 200,300	0	$ 200,300
Assets pledged as collateral | Derivatives
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	178,323		175,461
Assets pledged as collateral | Public deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	3,482		3,503
Assets pledged as collateral | Short-term borrowings
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged			9,257
Assets pledged as collateral | Other borrowings
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	183,360
Assets pledged as collateral | U.S. govt. sponsored agency securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	12,519		8,396
Assets pledged as collateral | U.S. govt. sponsored agency securities | Derivatives
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	11,188		6,222
Assets pledged as collateral | U.S. govt. sponsored agency securities | Public deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	1,331		1,481
Assets pledged as collateral | U.S. govt. sponsored agency securities | Short-term borrowings
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged			693
Assets pledged as collateral | Residential mortgage-backed and related securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	26,229		28,718
Assets pledged as collateral | Residential mortgage-backed and related securities | Derivatives
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	24,078		18,132
Assets pledged as collateral | Residential mortgage-backed and related securities | Public deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	2,151		2,022
Assets pledged as collateral | Residential mortgage-backed and related securities | Short-term borrowings
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged			8,564
Assets pledged as collateral | Municipal securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	326,417		151,107
Assets pledged as collateral | Municipal securities | Derivatives
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	143,057		$ 151,107
Assets pledged as collateral | Municipal securities | Other borrowings
Financial Instruments Owned and Pledged as Collateral [Line Items]
Investment securities pledged	$ 183,360

X

- Definition

Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(11))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481444/860-30-45-1

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- Definition

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 940
-SubTopic 320
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479035/940-320-45-2

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