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Note 3 - Investment Securities Available for Sale - Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Under one year, amortized cost	$ 735
Under one year, fair value	734
After one year through five years, amortized cost	6,575
After one year through five years, estimated fair value	6,655
After five years through ten years, amortized cost	19,025
After five years through ten years, estimated fair value	19,069
After ten years, amortized cost	75,751
After ten years, estimated fair value	68,425
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	508,097	$ 473,433
Debt Securities, Available-for-Sale, Excluding Accrued Interest	484,686	437,735
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]
Investment securities not due at a single maturity date, amortized cost	258,397
Investment securities not due at a single maturity date, estimated fair value	250,865
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	258,397	243,709
Debt Securities, Available-for-Sale, Excluding Accrued Interest	250,865	228,391
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member]
Investment securities not due at a single maturity date, amortized cost	147,614
Investment securities not due at a single maturity date, estimated fair value	138,938
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	147,614	133,749
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 138,938	$ 121,870

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
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+ References

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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+ References

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

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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