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Note 7 - Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Due in one year or less, Amortized Cost	$ 906,650
Due in one year or less, Fair Value	905,081
Due after one year through five years, Amortized Cost	92,523
Due after one year through five years, Fair Value	91,193
Due after five years through ten years, Amortized Cost	73,209
Due after five years through ten years, Fair Value	69,702
Due after ten years, Amortized Cost	655,817
Due after ten years, Fair Value	577,474
Total, amortized cost	1,728,199	$ 1,668,661
Total, fair value	$ 1,643,450	$ 1,547,128

X

- Definition

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
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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
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+ References

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