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Note 2 - Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Amortized cost | $ 295,079 | $ 299,162
Securities available-for-sale, gross unrealized gains | 301 | 404
Securities available-for-sale, gross unrealized losses | (20,493) | (17,874)
Securities available-for-sale, ACL | 0 | 0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025) | 274,887 | 281,692
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 4,023 | 4,179
Securities available-for-sale, gross unrealized gains | 61 | 62
Securities available-for-sale, gross unrealized losses | (116) | (86)
Securities available-for-sale, ACL | 0 | 0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025) | 3,968 | 4,155
US Treasury and Government [Member] |  |
Amortized cost | 47,675 | 47,665
Securities available-for-sale, gross unrealized gains | 0 | 0
Securities available-for-sale, gross unrealized losses | (3,749) | (3,357)
Securities available-for-sale, ACL | 0 | 0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025) | 43,926 | 44,308
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 126,641 | 127,469
Securities available-for-sale, gross unrealized gains | 1 | 53
Securities available-for-sale, gross unrealized losses | (10,826) | (9,198)
Securities available-for-sale, ACL | 0 | 0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025) | 115,816 | 118,324
Corporate Debt Securities [Member] |  |
Amortized cost | 2,000 | 2,000
Securities available-for-sale, gross unrealized gains | 0 | 0
Securities available-for-sale, gross unrealized losses | (30) | (29)
Securities available-for-sale, ACL | 0 | 0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025) | 1,970 | 1,971
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized cost | 26,684 | 27,222
Securities available-for-sale, gross unrealized gains | 157 | 180
Securities available-for-sale, gross unrealized losses | (1,064) | (908)
Securities available-for-sale, ACL | 0 | 0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025) | 25,777 | 26,494
Collateralized Mortgage Obligations [Member] |  |
Amortized cost | 81,569 | 83,907
Securities available-for-sale, gross unrealized gains | 37 | 49
Securities available-for-sale, gross unrealized losses | (4,707) | (4,295)
Securities available-for-sale, ACL | 0 | 0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025) | 76,899 | 79,661
Asset-Backed Securities [Member] |  |
Amortized cost | 6,487 | 6,720
Securities available-for-sale, gross unrealized gains | 45 | 60
Securities available-for-sale, gross unrealized losses | (1) | (1)
Securities available-for-sale, ACL | 0 | 0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025) | $ 6,531 | $ 6,779

X
- 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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