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Note 8 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | March 31, 2023 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 270,165 |  |  | $ | 34 |  |  | $ | 501 |  |  | $ | 269,698 |
U.S. government agency entities |  |  | 59,734 |  |  |  | 324 |  |  |  | 127 |  |  |  | 59,931 |
U.S. government sponsored entities |  |  | 40,000 |  |  |  | 14 |  |  |  | — |  |  |  | 40,014 |
Mortgage-backed securities . |  |  | 969,966 |  |  |  | 401 |  |  |  | 113,065 |  |  |  | 857,302 |
Collateralized mortgage obligations |  |  | 33,877 |  |  |  | — |  |  |  | 2,910 |  |  |  | 30,967 |
Corporate debt securities |  |  | 298,698 |  |  |  | 265 |  |  |  | 15,625 |  |  |  | 283,338 |
Total |  | $ | 1,672,440 |  |  | $ | 1,038 |  |  | $ | 132,228 |  |  | $ | 1,541,250 |
|  | 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] |
|  | March 31, 2023 |
|  | Securities Available-For-Sale |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 350,165 |  |  | $ | 348,984 |
Due after one year through five years |  |  | 256,256 |  |  |  | 241,910 |
Due after five years through ten years |  |  | 169,294 |  |  |  | 160,169 |
Due after ten years |  |  | 896,725 |  |  |  | 790,187 |
Total |  | $ | 1,672,440 |  |  | $ | 1,541,250 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | March 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 Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 172,306 |  |  | $ | 501 |  |  | $ | — |  |  | $ | — |  |  | $ | 172,306 |  |  | $ | 501 |
U.S. government agency entities |  |  | 6,617 |  |  |  | 3 |  |  |  | 1,676 |  |  |  | 124 |  |  |  | 8,293 |  |  |  | 127 |
Mortgage-backed securities. |  |  | 127,422 |  |  |  | 4,819 |  |  |  | 709,405 |  |  |  | 108,246 |  |  |  | 836,827 |  |  |  | 113,065 |
Collateralized mortgage obligations |  |  | 24,326 |  |  |  | 1,206 |  |  |  | 6,641 |  |  |  | 1,704 |  |  |  | 30,967 |  |  |  | 2,910 |
Corporate debt securities |  |  | 98,411 |  |  |  | 1,589 |  |  |  | 114,663 |  |  |  | 14,036 |  |  |  | 213,074 |  |  |  | 15,625 |
Total |  | $ | 429,082 |  |  | $ | 8,118 |  |  | $ | 832,385 |  |  | $ | 124,110 |  |  | $ | 1,261,467 |  |  | $ | 132,228 |
|  | December 31, 2022 |
|  | 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 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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