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Note 3 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Marketable Securities [Table Text Block] |
|  | September 30, 2025 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Allowance for |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Credit Losses |  |  | Value |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies |  | $ | 448 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | — |  |  | $ | 446 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 548,245 |  |  |  | 765 |  |  |  | (69,173 | ) |  |  | — |  |  |  | 479,837 |
Commercial |  |  | 1,329 |  |  |  | — |  |  |  | (50 | ) |  |  | — |  |  |  | 1,279 |
Asset backed securities |  |  | 16 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 16 |
Corporate bonds |  |  | 53,183 |  |  |  | — |  |  |  | (3,747 | ) |  |  | — |  |  |  | 49,436 |
Total available-for-sale investment securities |  |  | 603,221 |  |  |  | 765 |  |  |  | (72,972 | ) |  |  | — |  |  |  | 531,014 |
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of state and political agencies |  |  | 113,485 |  |  |  | — |  |  |  | (7,219 | ) |  |  | 75 |  |  |  | 106,266 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 145,866 |  |  |  | — |  |  |  | (21,535 | ) |  |  | 51 |  |  |  | 124,331 |
Total held-to-maturity investment securities |  |  | 259,351 |  |  |  | — |  |  |  | (28,754 | ) |  |  | 126 |  |  |  | 230,597 |
Total investment securities |  | $ | 862,572 |  |  | $ | 765 |  |  | $ | (101,726 | ) |  | $ | 126 |  |  | $ | 761,611 |
|  | December 31, 2024 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Allowance for |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Credit Losses |  |  | Value |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies |  | $ | 30,691 |  |  | $ | 18 |  |  | $ | (2 | ) |  |  | — |  |  | $ | 30,707 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 596,510 |  |  |  | 1 |  |  |  | (92,805 | ) |  |  | — |  |  |  | 503,706 |
Commercial |  |  | 1,350 |  |  |  | — |  |  |  | (99 | ) |  |  | — |  |  |  | 1,251 |
Asset backed securities |  |  | 19 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 19 |
Corporate bonds |  |  | 57,986 |  |  |  | — |  |  |  | (5,616 | ) |  |  | — |  |  |  | 52,370 |
Total available-for-sale investment securities |  |  | 686,556 |  |  |  | 19 |  |  |  | (98,522 | ) |  |  | — |  |  |  | 588,053 |
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of state and political agencies |  |  | 119,623 |  |  |  | — |  |  |  | (11,638 | ) |  |  | 77 |  |  |  | 107,985 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 156,093 |  |  |  | — |  |  |  | (27,092 | ) |  |  | 54 |  |  |  | 129,001 |
Total held-to-maturity investment securities |  |  | 275,716 |  |  |  | — |  |  |  | (38,730 | ) |  |  | 131 |  |  |  | 236,986 |
Total investment securities |  | $ | 962,272 |  |  | $ | 19 |  |  | $ | (137,252 | ) |  | $ | 131 |  |  | $ | 825,039 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  |  |  |  |  | September 30, 2025 |
|  |  |  |  |  | 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 |  |  | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 446 |  |  | $ | (2 | ) |  | $ | 446 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 123 |  |  |  | — |  |  |  | 54 |  |  |  | (69,173 | ) |  |  | 479,783 |  |  |  | (69,173 | ) |  |  | 479,837 |
Commercial |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | (50 | ) |  |  | 1,280 |  |  |  | (50 | ) |  |  | 1,280 |
Asset backed securities |  |  | 3 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 16 |  |  |  | — |  |  |  | 16 |
Corporate bonds |  |  | 11 |  |  |  | — |  |  |  | — |  |  |  | (3,747 | ) |  |  | 49,435 |  |  |  | (3,747 | ) |  |  | 49,435 |
Total available-for-sale investment securities |  |  | 140 |  |  | $ | — |  |  | $ | 54 |  |  | $ | (72,972 | ) |  | $ | 530,960 |  |  | $ | (72,972 | ) |  | $ | 531,014 |
|  |  |  |  |  | December 31, 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 | ) |  | $ | 327 |  |  | $ | (2 | ) |  | $ | 327 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 124 |  |  |  | (1,715 | ) |  |  | 116,800 |  |  |  | (91,090 | ) |  |  | 386,864 |  |  |  | (92,805 | ) |  |  | 503,664 |
Commercial |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | (99 | ) |  |  | 1,251 |  |  |  | (99 | ) |  |  | 1,251 |
Asset backed securities |  |  | 3 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 18 |  |  |  | — |  |  |  | 18 |
Corporate bonds |  |  | 12 |  |  |  | — |  |  |  | — |  |  |  | (5,616 | ) |  |  | 52,370 |  |  |  | (5,616 | ) |  |  | 52,370 |
Total available-for-sale investment securities |  |  | 141 |  |  | $ | (1,715 | ) |  | $ | 116,800 |  |  | $ | (96,807 | ) |  | $ | 440,830 |  |  | $ | (98,522 | ) |  | $ | 557,630 |
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 |  | $ | 11,648 |  |  | $ | 11,504 |  |  | $ | — |  |  | $ | — |
Due after one year through five years |  |  | 57,043 |  |  |  | 54,041 |  |  |  | 4,777 |  |  |  | 4,723 |
Due after five years through ten years |  |  | 37,390 |  |  |  | 34,026 |  |  |  | 49,998 |  |  |  | 46,254 |
Due after 10 years |  |  | 7,404 |  |  |  | 6,695 |  |  |  | 201 |  |  |  | 200 |
|  |  | 113,485 |  |  |  | 106,266 |  |  |  | 54,976 |  |  |  | 51,177 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 145,866 |  |  |  | 124,331 |  |  |  | 548,245 |  |  |  | 479,837 |
Total investment securities |  | $ | 259,351 |  |  | $ | 230,597 |  |  | $ | 603,221 |  |  | $ | 531,014 |
Investment [Table Text Block] |
|  | September 30, |  |  | December 31, |
(dollars in thousands) |  | 2025 |  |  | 2024 |
Federal Reserve |  | $ | 8,631 |  |  | $ | 7,519 |
FHLB |  |  | 13,020 |  |  |  | 13,656 |

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