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Note 7 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | March 31, 2025 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 541,663 |  |  | $ | 10 |  |  | $ | 29 |  |  | $ | 541,644 |
U.S. government agency entities |  |  | 8,787 |  |  |  | 50 |  |  |  | 114 |  |  |  | 8,723 |
Mortgage-backed securities |  |  | 775,132 |  |  |  | 337 |  |  |  | 95,794 |  |  |  | 679,675 |
Collateralized mortgage obligations |  |  | 26,949 |  |  |  | — |  |  |  | 2,286 |  |  |  | 24,663 |
Corporate debt securities |  |  | 183,365 |  |  |  | 160 |  |  |  | 4,190 |  |  |  | 179,335 |
Total |  | $ | 1,535,896 |  |  | $ | 557 |  |  | $ | 102,413 |  |  | $ | 1,434,040 |
|  | December 31, 2024 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 621,212 |  |  | $ | 250 |  |  | $ | — |  |  | $ | 621,462 |
U.S. government agency entities |  |  | 9,226 |  |  |  | 50 |  |  |  | 127 |  |  |  | 9,149 |
Mortgage-backed securities |  |  | 797,145 |  |  |  | 67 |  |  |  | 113,196 |  |  |  | 684,016 |
Collateralized mortgage obligations |  |  | 27,747 |  |  |  | — |  |  |  | 3,191 |  |  |  | 24,556 |
Corporate debt securities |  |  | 213,331 |  |  |  | 145 |  |  |  | 5,531 |  |  |  | 207,945 |
Total |  | $ | 1,668,661 |  |  | $ | 512 |  |  | $ | 122,045 |  |  | $ | 1,547,128 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | March 31, 2025 |
|  | Securities AFS |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 581,976 |  |  | $ | 581,554 |
Due after one year through five years |  |  | 157,871 |  |  |  | 153,934 |
Due after five years through ten years |  |  | 94,698 |  |  |  | 90,171 |
Due after ten years |  |  | 701,351 |  |  |  | 608,381 |
Total |  | $ | 1,535,896 |  |  | $ | 1,434,040 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | March 31, 2025 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 394,431 |  |  | $ | 29 |  |  | $ | — |  |  | $ | — |  |  | $ | 394,431 |  |  | $ | 29 |
U.S. government agency entities |  |  | 3,587 |  |  |  | 5 |  |  |  | 3,071 |  |  |  | 109 |  |  |  | 6,658 |  |  |  | 114 |
Mortgage-backed securities |  |  | 14,888 |  |  |  | 340 |  |  |  | 648,958 |  |  |  | 95,454 |  |  |  | 663,846 |  |  |  | 95,794 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 24,663 |  |  |  | 2,286 |  |  |  | 24,663 |  |  |  | 2,286 |
Corporate debt securities |  |  | 9,985 |  |  |  | 15 |  |  |  | 118,990 |  |  |  | 4,175 |  |  |  | 128,975 |  |  |  | 4,190 |
Total |  | $ | 422,891 |  |  | $ | 389 |  |  | $ | 795,682 |  |  | $ | 102,024 |  |  | $ | 1,218,573 |  |  | $ | 102,413 |
|  | December 31, 2024 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency entities |  | $ | 4,199 |  |  | $ | 8 |  |  | $ | 2,108 |  |  | $ | 119 |  |  | $ | 6,307 |  |  | $ | 127 |
Mortgage-backed securities |  |  | 29,955 |  |  |  | 959 |  |  |  | 653,236 |  |  |  | 112,237 |  |  |  | 683,191 |  |  |  | 113,196 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 24,556 |  |  |  | 3,191 |  |  |  | 24,556 |  |  |  | 3,191 |
Corporate debt securities |  |  | 24,900 |  |  |  | 100 |  |  |  | 127,744 |  |  |  | 5,431 |  |  |  | 152,644 |  |  |  | 5,531 |
Total |  | $ | 59,054 |  |  | $ | 1,067 |  |  | $ | 807,644 |  |  | $ | 120,978 |  |  | $ | 866,698 |  |  | $ | 122,045 |

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