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Note 7 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2025 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | ($ In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 776,501 |  |  | $ | 342 |  |  | $ | 10 |  |  | $ | 776,833 |
U.S. government agency entities |  |  | 6,928 |  |  |  | 51 |  |  |  | 119 |  |  |  | 6,860 |
U.S. government sponsored entities |  |  | 25,000 |  |  |  | 5 |  |  |  | — |  |  |  | 25,005 |
Mortgage-backed securities |  |  | 726,456 |  |  |  | 511 |  |  |  | 81,392 |  |  |  | 645,575 |
Collateralized mortgage obligations |  |  | 25,171 |  |  |  | — |  |  |  | 1,869 |  |  |  | 23,302 |
Corporate debt securities |  |  | 168,143 |  |  |  | 56 |  |  |  | 2,324 |  |  |  | 165,875 |
Total |  | $ | 1,728,199 |  |  | $ | 965 |  |  | $ | 85,714 |  |  | $ | 1,643,450 |
|  | 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] |
|  | September 30, 2025 |
|  | Securities AFS |
|  | Amortized Cost |  |  | Fair Value |
|  | ($ In thousands) |
Due in one year or less |  | $ | 906,650 |  |  | $ | 905,081 |
Due after one year through five years |  |  | 92,523 |  |  |  | 91,193 |
Due after five years through ten years |  |  | 73,209 |  |  |  | 69,702 |
Due after ten years |  |  | 655,817 |  |  |  | 577,474 |
Total |  | $ | 1,728,199 |  |  | $ | 1,643,450 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | September 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 |  | $ | 108,009 |  |  | $ | 10 |  |  | $ | — |  |  | $ | — |  |  | $ | 108,009 |  |  | $ | 10 |
U.S. government agency entities |  |  | 4,295 |  |  |  | 9 |  |  |  | 2,495 |  |  |  | 110 |  |  |  | 6,790 |  |  |  | 119 |
Mortgage-backed securities |  |  | 240 |  |  |  | — |  |  |  | 629,714 |  |  |  | 81,392 |  |  |  | 629,954 |  |  |  | 81,392 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 23,302 |  |  |  | 1,869 |  |  |  | 23,302 |  |  |  | 1,869 |
Corporate debt securities |  |  | 9,930 |  |  |  | 69 |  |  |  | 105,889 |  |  |  | 2,255 |  |  |  | 115,819 |  |  |  | 2,324 |
Total |  | $ | 122,474 |  |  | $ | 88 |  |  | $ | 761,400 |  |  | $ | 85,626 |  |  | $ | 883,874 |  |  | $ | 85,714 |
|  | 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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