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Note 4 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | 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 |
|  | As of December 31, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
U.S. government agency entities |  |  | 86,475 |  |  |  | 1,169 |  |  |  | 135 |  |  |  | 87,509 |
Mortgage-backed securities |  |  | 886,614 |  |  |  | 9,465 |  |  |  | 7,414 |  |  |  | 888,665 |
Collateralized mortgage obligations |  |  | 9,547 |  |  |  | — |  |  |  | 430 |  |  |  | 9,117 |
Corporate debt securities |  |  | 144,231 |  |  |  | 441 |  |  |  | 2,654 |  |  |  | 142,018 |
Total |  | $ | 1,126,867 |  |  | $ | 11,075 |  |  | $ | 10,633 |  |  | $ | 1,127,309 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities Available-for-Sale |
|  | As of December 31, 2022 |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 311,603 |  |  | $ | 310,050 |
Due after one year through five years |  |  | 213,395 |  |  |  | 196,616 |
Due after five years through ten years |  |  | 168,767 |  |  |  | 159,448 |
Due after ten years |  |  | 928,408 |  |  |  | 807,234 |
Total |  | $ | 1,622,173 |  |  | $ | 1,473,348 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | 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 |
|  | As of December 31, 2021 |
|  | 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 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
U.S. government agency entities |  |  | — |  |  |  | — |  |  |  | 2,337 |  |  |  | 135 |  |  |  | 2,337 |  |  |  | 135 |
Mortgage-backed securities |  |  | 527,276 |  |  |  | 6,659 |  |  |  | 6,496 |  |  |  | 755 |  |  |  | 533,772 |  |  |  | 7,414 |
Collateralized mortgage obligations |  |  | 8,989 |  |  |  | 417 |  |  |  | 128 |  |  |  | 13 |  |  |  | 9,117 |  |  |  | 430 |
Corporate debt securities |  |  | 103,720 |  |  |  | 2,122 |  |  |  | 19,468 |  |  |  | 532 |  |  |  | 123,188 |  |  |  | 2,654 |
Total |  | $ | 639,985 |  |  | $ | 9,198 |  |  | $ | 28,429 |  |  | $ | 1,435 |  |  | $ | 668,414 |  |  | $ | 10,633 |

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