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Note 4 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | September 30, 2024 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Allowance for |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Credit Losses |  |  | Value |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies |  | $ | 739 |  |  | $ | 2 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | 739 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 488,915 |  |  |  | 2 |  |  |  | (74,529 | ) |  |  | — |  |  |  | 414,388 |
Commercial |  |  | 1,460 |  |  |  | — |  |  |  | (59 | ) |  |  | — |  |  |  | 1,401 |
Asset backed securities |  |  | 20 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 20 |
Corporate bonds |  |  | 57,988 |  |  |  | — |  |  |  | (8,533 | ) |  |  | — |  |  |  | 49,455 |
Total available-for-sale investment securities |  |  | 549,122 |  |  |  | 4 |  |  |  | (83,123 | ) |  |  | — |  |  |  | 466,003 |
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of state and political agencies |  |  | 122,717 |  |  |  | — |  |  |  | (9,124 | ) |  |  | 81 |  |  |  | 113,593 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 159,333 |  |  |  | — |  |  |  | (23,064 | ) |  |  | 56 |  |  |  | 136,269 |
Total held-to-maturity investment securities |  |  | 282,050 |  |  |  | — |  |  |  | (32,188 | ) |  |  | 137 |  |  |  | 249,862 |
Total investment securities |  | $ | 831,172 |  |  | $ | 4 |  |  | $ | (115,311 | ) |  | $ | 137 |  |  | $ | 715,865 |
|  | December 31, 2023 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Allowance for |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Credit Losses |  |  | Value |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies |  | $ | 1,119 |  |  | $ | 4 |  |  | $ | (3 | ) |  |  | — |  |  | $ | 1,120 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 524,140 |  |  |  | 1 |  |  |  | (88,547 | ) |  |  | — |  |  |  | 435,594 |
Commercial |  |  | 1,476 |  |  |  | — |  |  |  | (123 | ) |  |  | — |  |  |  | 1,353 |
Asset backed securities |  |  | 26 |  |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | 25 |
Corporate bonds |  |  | 57,993 |  |  |  | — |  |  |  | (9,349 | ) |  |  | — |  |  |  | 48,644 |
Total available-for-sale investment securities |  |  | 584,754 |  |  |  | 5 |  |  |  | (98,023 | ) |  |  | — |  |  |  | 486,736 |
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of state and political agencies |  |  | 129,603 |  |  |  | — |  |  |  | (12,613 | ) |  |  | 114 |  |  |  | 116,990 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 170,125 |  |  |  | — |  |  |  | (28,498 | ) |  |  | 99 |  |  |  | 141,627 |
Total held-to-maturity investment securities |  |  | 299,728 |  |  |  | — |  |  |  | (41,111 | ) |  |  | 213 |  |  |  | 258,617 |
Total investment securities |  | $ | 884,482 |  |  | $ | 5 |  |  | $ | (139,134 | ) |  | $ | 213 |  |  | $ | 745,353 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  |  |  |  |  | September 30, 2024 |
|  |  |  |  |  | Less than 12 Months |  |  | Over 12 Months |  |  | Total |
|  | Number of |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |
(dollars in thousands) |  | Holdings |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies |  |  | 1 |  |  | $ | (2 | ) |  | $ | 370 |  |  | $ | — |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 370 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 108 |  |  |  | — |  |  |  | — |  |  |  | (74,529 | ) |  |  | 414,315 |  |  |  | (74,529 | ) |  |  | 414,315 |
Commercial |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | (59 | ) |  |  | 1,401 |  |  |  | (59 | ) |  |  | 1,401 |
Asset backed securities |  |  | 3 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 20 |  |  |  | — |  |  |  | 20 |
Corporate bonds |  |  | 12 |  |  |  | — |  |  |  | — |  |  |  | (8,533 | ) |  |  | 49,455 |  |  |  | (8,533 | ) |  |  | 49,455 |
Total available-for-sale investment securities |  |  | 125 |  |  | $ | (2 | ) |  | $ | 370 |  |  | $ | (83,121 | ) |  | $ | 465,191 |  |  | $ | (83,123 | ) |  | $ | 465,561 |
|  |  |  |  |  | December 31, 2023 |
|  |  |  |  |  | Less than 12 Months |  |  | Over 12 Months |  |  | Total |
|  | Number of |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |
(dollars in thousands) |  | Holdings |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies |  |  | 1 |  |  | $ | (3 | ) |  | $ | 489 |  |  | $ | — |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 489 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 112 |  |  |  | — |  |  |  | 43 |  |  |  | (88,547 | ) |  |  | 435,505 |  |  |  | (88,547 | ) |  |  | 435,548 |
Commercial |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | (123 | ) |  |  | 1,353 |  |  |  | (123 | ) |  |  | 1,353 |
Asset backed securities |  |  | 3 |  |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | 25 |  |  |  | (1 | ) |  |  | 25 |
Corporate bonds |  |  | 12 |  |  |  | — |  |  |  | — |  |  |  | (9,349 | ) |  |  | 48,644 |  |  |  | (9,349 | ) |  |  | 48,644 |
Total available-for-sale investment securities |  |  | 129 |  |  | $ | (3 | ) |  | $ | 532 |  |  | $ | (98,020 | ) |  | $ | 485,527 |  |  | $ | (98,023 | ) |  | $ | 486,059 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Held-to-maturity |  |  | Available-for-sale |
|  | Carrying |  |  | Fair |  |  | Amortized |  |  | Fair |
(dollars in thousands) |  | Value |  |  | Value |  |  | Cost |  |  | Value |
Due within one year or less |  | $ | 8,282 |  |  | $ | 8,203 |  |  | $ | — |  |  | $ | — |
Due after one year through five years |  |  | 56,385 |  |  |  | 53,122 |  |  |  | 1,838 |  |  |  | 1,778 |
Due after five years through ten years |  |  | 48,042 |  |  |  | 43,323 |  |  |  | 57,992 |  |  |  | 49,460 |
Due after 10 years |  |  | 10,008 |  |  |  | 8,945 |  |  |  | 377 |  |  |  | 377 |
|  |  | 122,717 |  |  |  | 113,593 |  |  |  | 60,207 |  |  |  | 51,615 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 159,333 |  |  |  | 136,269 |  |  |  | 488,915 |  |  |  | 414,388 |
Total investment securities |  | $ | 282,050 |  |  | $ | 249,862 |  |  | $ | 549,122 |  |  | $ | 466,003 |
Federal Home Loan Bank, Advances [Table Text Block] |
|  | September 30, |  |  | December 31, |
(dollars in thousands) |  | 2024 |  |  | 2023 |
Federal Reserve |  | $ | 4,623 |  |  | $ | 4,623 |
FHLB |  |  | 13,757 |  |  |  | 16,566 |

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