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Note 3 - Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Marketable Securities [Table Text Block] |
|  | June 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 |  | $ | 638 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | — |  |  | $ | 637 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 564,826 |  |  |  | 330 |  |  |  | (76,217 | ) |  |  | — |  |  |  | 488,939 |
Commercial |  |  | 1,336 |  |  |  | — |  |  |  | (56 | ) |  |  | — |  |  |  | 1,280 |
Asset backed securities |  |  | 17 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 17 |
Corporate bonds |  |  | 53,982 |  |  |  | — |  |  |  | (3,703 | ) |  |  | — |  |  |  | 50,279 |
Total available-for-sale investment securities |  |  | 620,799 |  |  |  | 330 |  |  |  | (79,977 | ) |  |  | — |  |  |  | 541,152 |
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of state and political agencies |  |  | 114,141 |  |  |  | — |  |  |  | (8,770 | ) |  |  | 75 |  |  |  | 105,371 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 149,692 |  |  |  | — |  |  |  | (23,559 | ) |  |  | 52 |  |  |  | 126,133 |
Total held-to-maturity investment securities |  |  | 263,833 |  |  |  | — |  |  |  | (32,329 | ) |  |  | 127 |  |  |  | 231,504 |
Total investment securities |  | $ | 884,632 |  |  | $ | 330 |  |  | $ | (112,306 | ) |  | $ | 127 |  |  | $ | 772,656 |
|  | 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] |
|  |  |  |  |  | June 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 |  |  | $ | — |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 469 |  |  | $ | (1 | ) |  | $ | 469 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 111 |  |  |  | (1 | ) |  |  | 35 |  |  |  | (76,216 | ) |  |  | 383,021 |  |  |  | (76,217 | ) |  |  | 383,056 |
Commercial |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | (56 | ) |  |  | 1,278 |  |  |  | (56 | ) |  |  | 1,278 |
Asset backed securities |  |  | 3 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 16 |  |  |  | — |  |  |  | 16 |
Corporate bonds |  |  | 11 |  |  |  | — |  |  |  | — |  |  |  | (3,703 | ) |  |  | 50,279 |  |  |  | (3,703 | ) |  |  | 50,279 |
Total available-for-sale investment securities |  |  | 128 |  |  | $ | (1 | ) |  | $ | 35 |  |  | $ | (79,976 | ) |  | $ | 435,063 |  |  | $ | (79,977 | ) |  | $ | 435,098 |
|  |  |  |  |  | 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 |  | $ | 6,547 |  |  | $ | 6,461 |  |  | $ | — |  |  | $ | — |
Due after one year through five years |  |  | 57,083 |  |  |  | 53,878 |  |  |  | 1,625 |  |  |  | 1,568 |
Due after five years through ten years |  |  | 43,077 |  |  |  | 38,521 |  |  |  | 53,999 |  |  |  | 50,296 |
Due after 10 years |  |  | 7,434 |  |  |  | 6,511 |  |  |  | 349 |  |  |  | 349 |
|  |  | 114,141 |  |  |  | 105,371 |  |  |  | 55,973 |  |  |  | 52,213 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 149,692 |  |  |  | 126,133 |  |  |  | 564,826 |  |  |  | 488,939 |
Total investment securities |  | $ | 263,833 |  |  | $ | 231,504 |  |  | $ | 620,799 |  |  | $ | 541,152 |
Investment [Table Text Block] |
|  | June 30, |  |  | December 31, |
(dollars in thousands) |  | 2025 |  |  | 2024 |
Federal Reserve |  | $ | 8,631 |  |  | $ | 7,519 |
FHLB |  |  | 18,161 |  |  |  | 13,656 |

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