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Note 3 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Marketable Securities [Table Text Block] |
|  | March 31, 2025 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Allowance for |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Credit Losses |  |  | Value |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies |  | $ | 10,676 |  |  | $ | 2 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | 10,676 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 581,983 |  |  |  | 35 |  |  |  | (80,318 | ) |  |  | — |  |  |  | 501,700 |
Commercial |  |  | 1,343 |  |  |  | — |  |  |  | (69 | ) |  |  | — |  |  |  | 1,274 |
Asset backed securities |  |  | 18 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 18 |
Corporate bonds |  |  | 57,984 |  |  |  | — |  |  |  | (3,924 | ) |  |  | — |  |  |  | 54,060 |
Total available-for-sale investment securities |  |  | 652,004 |  |  |  | 37 |  |  |  | (84,313 | ) |  |  | — |  |  |  | 567,728 |
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of state and political agencies |  |  | 115,636 |  |  |  | — |  |  |  | (9,941 | ) |  |  | 76 |  |  |  | 105,695 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 153,124 |  |  |  | — |  |  |  | (24,244 | ) |  |  | 53 |  |  |  | 128,880 |
Total held-to-maturity investment securities |  |  | 268,760 |  |  |  | — |  |  |  | (34,185 | ) |  |  | 129 |  |  |  | 234,575 |
Total investment securities |  | $ | 920,764 |  |  | $ | 37 |  |  | $ | (118,498 | ) |  | $ | 129 |  |  | $ | 802,303 |
|  | 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] |
|  |  |  |  |  | March 31, 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 | ) |  | $ | 351 |  |  | $ | (1 | ) |  | $ | 308 |  |  | $ | (2 | ) |  | $ | 659 |
Mortgage backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 117 |  |  |  | (262 | ) |  |  | 56,036 |  |  |  | (80,056 | ) |  |  | 387,207 |  |  |  | (80,318 | ) |  |  | 443,243 |
Commercial |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | (69 | ) |  |  | 1,274 |  |  |  | (69 | ) |  |  | 1,274 |
Asset backed securities |  |  | 3 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 18 |  |  |  | — |  |  |  | 18 |
Corporate bonds |  |  | 12 |  |  |  | — |  |  |  | — |  |  |  | (3,924 | ) |  |  | 54,060 |  |  |  | (3,924 | ) |  |  | 54,060 |
Total available-for-sale investment securities |  |  | 135 |  |  | $ | (263 | ) |  | $ | 56,387 |  |  | $ | (84,050 | ) |  | $ | 442,867 |  |  | $ | (84,313 | ) |  | $ | 499,254 |
|  |  |  |  |  | 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 |  | $ | 6,911 |  |  | $ | 6,808 |  |  | $ | 4,999 |  |  | $ | 4,999 |
Due after one year through five years |  |  | 54,015 |  |  |  | 50,595 |  |  |  | 6,667 |  |  |  | 6,598 |
Due after five years through ten years |  |  | 47,247 |  |  |  | 41,740 |  |  |  | 58,002 |  |  |  | 54,077 |
Due after 10 years |  |  | 7,463 |  |  |  | 6,552 |  |  |  | 353 |  |  |  | 354 |
|  |  | 115,636 |  |  |  | 105,695 |  |  |  | 70,021 |  |  |  | 66,028 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  |  | 153,124 |  |  |  | 128,880 |  |  |  | 581,983 |  |  |  | 501,700 |
Total investment securities |  | $ | 268,760 |  |  | $ | 234,575 |  |  | $ | 652,004 |  |  | $ | 567,728 |
Investment [Table Text Block] |
|  | March 31, |  |  | December 31, |
(dollars in thousands) |  | 2025 |  |  | 2024 |
Federal Reserve |  | $ | 8,331 |  |  | $ | 7,519 |
FHLB |  |  | 12,871 |  |  |  | 13,656 |

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