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Note 4 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | As of December 31, 2023 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
|  | As of December 31, 2022 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 241,611 |  |  | $ | — |  |  | $ | 1,111 |  |  | $ | 240,500 |
U.S. government agency entities |  |  | 63,347 |  |  |  | 384 |  |  |  | 121 |  |  |  | 63,610 |
U.S. government sponsored entities |  |  | 30,000 |  |  |  | — |  |  |  | — |  |  |  | 30,000 |
Mortgage-backed securities |  |  | 993,883 |  |  |  | 194 |  |  |  | 126,983 |  |  |  | 867,094 |
Collateralized mortgage obligations |  |  | 34,552 |  |  |  | — |  |  |  | 3,491 |  |  |  | 31,061 |
Corporate debt securities |  |  | 258,780 |  |  |  | 112 |  |  |  | 17,809 |  |  |  | 241,083 |
Total |  | $ | 1,622,173 |  |  | $ | 690 |  |  | $ | 149,515 |  |  | $ | 1,473,348 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities Available-for-Sale |
|  | As of December 31, 2023 |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 525,406 |  |  | $ | 524,948 |
Due after one year through five years |  |  | 227,132 |  |  |  | 215,834 |
Due after five years through ten years |  |  | 149,042 |  |  |  | 141,044 |
Due after ten years |  |  | 824,500 |  |  |  | 722,744 |
Total |  | $ | 1,726,080 |  |  | $ | 1,604,570 |
Gain (Loss) on Securities [Table Text Block] |
|  | As of December 31, 2023 |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Gross Unrealized |  |  | Fair |  |  | Gross Unrealized |  |  | Fair |  |  | Gross Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
|  | As of December 31, 2022 |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Gross Unrealized |  |  | Fair |  |  | Gross Unrealized |  |  | Fair |  |  | Gross Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 240,500 |  |  | $ | 1,111 |  |  | $ | — |  |  | $ | — |  |  | $ | 240,500 |  |  | $ | 1,111 |
U.S. government agency entities |  |  | — |  |  |  | — |  |  |  | 1,806 |  |  |  | 121 |  |  |  | 1,806 |  |  |  | 121 |
Mortgage-backed securities |  |  | 394,123 |  |  |  | 33,042 |  |  |  | 452,739 |  |  |  | 93,941 |  |  |  | 846,862 |  |  |  | 126,983 |
Collateralized mortgage obligations |  |  | 24,427 |  |  |  | 1,614 |  |  |  | 6,634 |  |  |  | 1,877 |  |  |  | 31,061 |  |  |  | 3,491 |
Corporate debt securities |  |  | 109,995 |  |  |  | 3,256 |  |  |  | 100,977 |  |  |  | 14,553 |  |  |  | 210,972 |  |  |  | 17,809 |
Total |  | $ | 769,045 |  |  | $ | 39,023 |  |  | $ | 562,156 |  |  | $ | 110,492 |  |  | $ | 1,331,201 |  |  | $ | 149,515 |

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