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Note 2 - Debt Securities - Amortized Cost and Fair Value of Contractual Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Due within one year, amortized cost | $ 441,619 | $ 223,145
Due within one year, fair value | 443,833 | 223,477
Due from one to five years, amortized cost | 147,475 | 478,868
Due from one to five years, fair value | 147,058 | 475,985
Due from five to ten years, amortized cost | 332,436 | 258,611
Due from five to ten years, fair value | 325,957 | 240,114
Due after ten years, amortized cost | 18,657 | 3,000
Due after ten years, fair value | 18,673 | 2,550
Mortgage-backed securities, amortized cost | 133,126 | 243,435
Mortgage-backed securities, fair value | 133,304 | 219,274
Available for sale, amortized cost | 1,073,313 | 1,207,059
Available for sale, fair value | 1,068,825 | 1,161,400
Held to maturity debt securities, Due within one year, amortized cost | 53,787 | 250
Held to maturity debt securities, Due within one year, fair value | 52,811 | 250
Held to maturity debt securities, Due from one to five years, amortized cost | 204,192 | 256,743
Held to maturity debt securities, Due from one to five years, fair value | 195,279 | 236,586
Held to maturity debt securities, Due from five to ten years, amortized cost | 0 | 495
Held to maturity debt securities, Due from five to ten years, fair value | 0 | 431
Held to maturity debt securities, Due after ten years, amortized cost | 0 | 0
Held to maturity debt securities, Due after ten years, fair value | 0 | 0
Mortgage-backed securities, amortized cost | 402,097 | 457,365
Mortgage-backed securities, fair value | 368,445 | 402,229
Held to maturity, amortized cost | 660,076 | 714,853
Held to maturity debt securities, fair value | $ 616,535 | $ 639,496

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- 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 after 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 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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- Definition Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing after 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/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477268/942-320-50-3 + Details
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