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Note 7 - Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2025 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 768,375 |  |  | $ | 14 |  |  | $ | 140 |  |  | $ | 768,249 |
U.S. government agency entities |  |  | 7,991 |  |  |  | 54 |  |  |  | 111 |  |  |  | 7,934 |
Mortgage-backed securities |  |  | 751,160 |  |  |  | 102 |  |  |  | 92,831 |  |  |  | 658,431 |
Collateralized mortgage obligations |  |  | 26,023 |  |  |  | — |  |  |  | 2,096 |  |  |  | 23,927 |
Corporate debt securities |  |  | 193,154 |  |  |  | 79 |  |  |  | 3,341 |  |  |  | 189,892 |
Total |  | $ | 1,746,703 |  |  | $ | 249 |  |  | $ | 98,519 |  |  | $ | 1,648,433 |
|  | 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] |
|  | June 30, 2025 |
|  | Securities AFS |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 838,473 |  |  | $ | 837,566 |
Due after one year through five years |  |  | 153,104 |  |  |  | 149,740 |
Due after five years through ten years |  |  | 72,971 |  |  |  | 69,984 |
Due after ten years |  |  | 682,155 |  |  |  | 591,143 |
Total |  | $ | 1,746,703 |  |  | $ | 1,648,433 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | June 30, 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 |  | $ | 570,370 |  |  | $ | 140 |  |  | $ | — |  |  | $ | — |  |  | $ | 570,370 |  |  | $ | 140 |
U.S. government agency entities |  |  | 2,332 |  |  |  | 2 |  |  |  | 2,845 |  |  |  | 109 |  |  |  | 5,177 |  |  |  | 111 |
Mortgage-backed securities |  |  | 28,273 |  |  |  | 424 |  |  |  | 628,662 |  |  |  | 92,407 |  |  |  | 656,935 |  |  |  | 92,831 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 23,927 |  |  |  | 2,096 |  |  |  | 23,927 |  |  |  | 2,096 |
Corporate debt securities |  |  | 9,980 |  |  |  | 20 |  |  |  | 119,833 |  |  |  | 3,321 |  |  |  | 129,813 |  |  |  | 3,341 |
Total |  | $ | 610,955 |  |  | $ | 586 |  |  | $ | 775,267 |  |  | $ | 97,933 |  |  | $ | 1,386,222 |  |  | $ | 98,519 |
|  | 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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