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Note 3 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | As of 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 |
|  | As of December 31, 2023 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 495,167 |  |  | $ | 153 |  |  | $ | 20 |  |  | $ | 495,300 |
U.S. government agency entities |  |  | 48,282 |  |  |  | 117 |  |  |  | 230 |  |  |  | 48,169 |
Mortgage-backed securities |  |  | 892,942 |  |  |  | 223 |  |  |  | 106,442 |  |  |  | 786,723 |
Collateralized mortgage obligations |  |  | 31,238 |  |  |  | — |  |  |  | 3,194 |  |  |  | 28,044 |
Corporate debt securities |  |  | 258,451 |  |  |  | 22 |  |  |  | 12,139 |  |  |  | 246,334 |
Total |  | $ | 1,726,080 |  |  | $ | 515 |  |  | $ | 122,025 |  |  | $ | 1,604,570 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities AFS |
|  | As of December 31, 2024 |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 671,499 |  |  | $ | 671,217 |
Due after one year through five years |  |  | 169,826 |  |  |  | 164,819 |
Due after five years through ten years |  |  | 109,494 |  |  |  | 102,445 |
Due after ten years |  |  | 717,842 |  |  |  | 608,647 |
Total |  | $ | 1,668,661 |  |  | $ | 1,547,128 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | As of December 31, 2024 |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Gross Unrealized |  |  | Fair |  |  | Gross Unrealized |  |  | Fair |  |  | Gross 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 |
|  | As of December 31, 2023 |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Gross Unrealized |  |  | Fair |  |  | Gross Unrealized |  |  | Fair |  |  | Gross Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 49,831 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 49,831 |  |  | $ | 20 |
U.S. government agency entities |  |  | 18,301 |  |  |  | 108 |  |  |  | 1,313 |  |  |  | 122 |  |  |  | 19,614 |  |  |  | 230 |
Mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | 768,274 |  |  |  | 106,442 |  |  |  | 768,274 |  |  |  | 106,442 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 28,044 |  |  |  | 3,194 |  |  |  | 28,044 |  |  |  | 3,194 |
Corporate debt securities |  |  | 64,448 |  |  |  | 552 |  |  |  | 166,864 |  |  |  | 11,587 |  |  |  | 231,312 |  |  |  | 12,139 |
Total |  | $ | 132,580 |  |  | $ | 680 |  |  | $ | 964,495 |  |  | $ | 121,345 |  |  | $ | 1,097,075 |  |  | $ | 122,025 |

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