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Note 7 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | March 31, 2024 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 541,914 |  |  | $ | 4 |  |  | $ | 120 |  |  | $ | 541,798 |
U.S. government agency entities |  |  | 12,123 |  |  |  | 61 |  |  |  | 126 |  |  |  | 12,058 |
U.S. government sponsored entities |  |  | 59,785 |  |  |  | — |  |  |  | 40 |  |  |  | 59,745 |
Mortgage-backed securities |  |  | 871,231 |  |  |  | 63 |  |  |  | 117,132 |  |  |  | 754,162 |
Collateralized mortgage obligations |  |  | 30,494 |  |  |  | — |  |  |  | 3,296 |  |  |  | 27,198 |
Corporate debt securities |  |  | 268,368 |  |  |  | 34 |  |  |  | 10,196 |  |  |  | 258,206 |
Total |  | $ | 1,783,915 |  |  | $ | 162 |  |  | $ | 130,910 |  |  | $ | 1,653,167 |
|  | 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] |
|  | March 31, 2024 |
|  | Securities AFS |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 661,864 |  |  | $ | 661,135 |
Due after one year through five years |  |  | 207,407 |  |  |  | 198,023 |
Due after five years through ten years |  |  | 140,147 |  |  |  | 131,192 |
Due after ten years |  |  | 774,497 |  |  |  | 662,817 |
Total |  | $ | 1,783,915 |  |  | $ | 1,653,167 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | March 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. treasury securities |  | $ | 392,376 |  |  | $ | 120 |  |  | $ | — |  |  | $ | — |  |  | $ | 392,376 |  |  | $ | 120 |
U.S. government agency entities |  |  | 1,471 |  |  |  | 2 |  |  |  | 2,524 |  |  |  | 124 |  |  |  | 3,995 |  |  |  | 126 |
U.S. government sponsored entities |  |  | 59,745 |  |  |  | 40 |  |  |  | — |  |  |  | — |  |  |  | 59,745 |  |  |  | 40 |
Mortgage-backed securities |  |  | 16,923 |  |  |  | 87 |  |  |  | 736,362 |  |  |  | 117,045 |  |  |  | 753,285 |  |  |  | 117,132 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 27,198 |  |  |  | 3,296 |  |  |  | 27,198 |  |  |  | 3,296 |
Corporate debt securities |  |  | 54,531 |  |  |  | 469 |  |  |  | 168,641 |  |  |  | 9,727 |  |  |  | 223,172 |  |  |  | 10,196 |
Total |  | $ | 525,046 |  |  | $ | 718 |  |  | $ | 934,725 |  |  | $ | 130,192 |  |  | $ | 1,459,771 |  |  | $ | 130,910 |
|  | December 31, 2023 |
|  | 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 |  | $ | 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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