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Note 7 - Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2024 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 545,093 |  |  | $ | — |  |  | $ | 93 |  |  | $ | 545,000 |
U.S. government agency entities |  |  | 11,063 |  |  |  | 65 |  |  |  | 118 |  |  |  | 11,010 |
U.S. government sponsored entities |  |  | 79,785 |  |  |  | — |  |  |  | 51 |  |  |  | 79,734 |
Mortgage-backed securities |  |  | 846,407 |  |  |  | 63 |  |  |  | 117,706 |  |  |  | 728,764 |
Collateralized mortgage obligations |  |  | 29,551 |  |  |  | — |  |  |  | 3,472 |  |  |  | 26,079 |
Corporate debt securities |  |  | 268,352 |  |  |  | 26 |  |  |  | 10,234 |  |  |  | 258,144 |
Total |  | $ | 1,780,251 |  |  | $ | 154 |  |  | $ | 131,674 |  |  | $ | 1,648,731 |
|  | 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] |
|  | June 30, 2024 |
|  | Securities AFS |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 685,036 |  |  | $ | 684,480 |
Due after one year through five years |  |  | 210,194 |  |  |  | 200,598 |
Due after five years through ten years |  |  | 129,557 |  |  |  | 120,163 |
Due after ten years |  |  | 755,464 |  |  |  | 643,490 |
Total |  | $ | 1,780,251 |  |  | $ | 1,648,731 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | June 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. treasury securities |  | $ | 545,000 |  |  | $ | 93 |  |  | $ | — |  |  | $ | — |  |  | $ | 545,000 |  |  | $ | 93 |
U.S. government agency entities |  |  | 1,303 |  |  |  | 1 |  |  |  | 2,426 |  |  |  | 117 |  |  |  | 3,729 |  |  |  | 118 |
U.S. government sponsored entities |  |  | 79,734 |  |  |  | 51 |  |  |  | — |  |  |  | — |  |  |  | 79,734 |  |  |  | 51 |
Mortgage-backed securities |  |  | 16,029 |  |  |  | 245 |  |  |  | 711,787 |  |  |  | 117,461 |  |  |  | 727,816 |  |  |  | 117,706 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 26,079 |  |  |  | 3,472 |  |  |  | 26,079 |  |  |  | 3,472 |
Corporate debt securities |  |  | 64,857 |  |  |  | 209 |  |  |  | 178,261 |  |  |  | 10,025 |  |  |  | 243,118 |  |  |  | 10,234 |
Total |  | $ | 706,923 |  |  | $ | 599 |  |  | $ | 918,553 |  |  | $ | 131,075 |  |  | $ | 1,625,476 |  |  | $ | 131,674 |
|  | 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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