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Note 7 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2024 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 494,517 |  |  | $ | 494 |  |  | $ | — |  |  | $ | 495,011 |
U.S. government agency entities |  |  | 10,180 |  |  |  | 61 |  |  |  | 116 |  |  |  | 10,125 |
Mortgage-backed securities |  |  | 821,023 |  |  |  | 395 |  |  |  | 86,882 |  |  |  | 734,536 |
Collateralized mortgage obligations |  |  | 28,663 |  |  |  | — |  |  |  | 2,229 |  |  |  | 26,434 |
Corporate debt securities |  |  | 248,313 |  |  |  | 299 |  |  |  | 6,362 |  |  |  | 242,250 |
Total |  | $ | 1,602,696 |  |  | $ | 1,249 |  |  | $ | 95,589 |  |  | $ | 1,508,356 |
|  | 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] |
|  | September 30, 2024 |
|  | Securities AFS |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 564,646 |  |  | $ | 564,312 |
Due after one year through five years |  |  | 182,986 |  |  |  | 177,692 |
Due after five years through ten years |  |  | 119,016 |  |  |  | 113,945 |
Due after ten years |  |  | 736,048 |  |  |  | 652,407 |
Total |  | $ | 1,602,696 |  |  | $ | 1,508,356 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | September 30, 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 |  | $ | 1,182 |  |  | $ | 1 |  |  | $ | 2,223 |  |  | $ | 115 |  |  | $ | 3,405 |  |  | $ | 116 |
Mortgage-backed securities |  |  | 8 |  |  |  | — |  |  |  | 701,624 |  |  |  | 86,882 |  |  |  | 701,632 |  |  |  | 86,882 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 26,434 |  |  |  | 2,229 |  |  |  | 26,434 |  |  |  | 2,229 |
Corporate debt securities |  |  | 19,974 |  |  |  | 26 |  |  |  | 146,866 |  |  |  | 6,336 |  |  |  | 166,840 |  |  |  | 6,362 |
Total |  | $ | 21,164 |  |  | $ | 27 |  |  | $ | 877,147 |  |  | $ | 95,562 |  |  | $ | 898,311 |  |  | $ | 95,589 |
|  | 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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