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Note 2 - Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities available-for-sale, amortized cost | $ 825,358 | $ 1,114,961
Securities available-for-sale, unrealized gains | 296 | 144
Securities available-for-sale, unrealized losses | (88,134) | (124,991)
Securities available-for-sale, fair value | 737,520 | 990,114
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, amortized cost | 77,669 | 88,895
Securities available-for-sale, unrealized gains | 105 | 110
Securities available-for-sale, unrealized losses | (3,088) | (4,847)
Securities available-for-sale, fair value | 74,686 | 84,158
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Securities available-for-sale, amortized cost | 622,953 | 696,767
Securities available-for-sale, unrealized gains | 181 | 0
Securities available-for-sale, unrealized losses | (74,850) | (105,790)
Securities available-for-sale, fair value | 548,284 | 590,977
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized cost | 124,141 | 128,431
Securities available-for-sale, unrealized gains | 10 | 1
Securities available-for-sale, unrealized losses | (10,154) | (14,198)
Securities available-for-sale, fair value | 113,997 | 114,234
Other Debt Obligations [Member] |  |
Securities available-for-sale, amortized cost | 595 | 2,686
Securities available-for-sale, unrealized gains | 0 | 0
Securities available-for-sale, unrealized losses | (42) | (156)
Securities available-for-sale, fair value | $ 553 | 2,530
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, amortized cost |  | 198,182
Securities available-for-sale, unrealized gains |  | 33
Securities available-for-sale, unrealized losses |  | 0
Securities available-for-sale, fair value |  | $ 198,215

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- 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 + Details
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X
- Definition Amount, before tax, of unrealized loss 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 (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of 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 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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- Definition Amount excluding accrued interest, of 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/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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