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Note 7 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2021
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | March 31, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 40,709 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 40,720 |
U.S. government agency entities |  |  | 95,637 |  |  |  | 705 |  |  |  | 291 |  |  |  | 96,051 |
Mortgage-backed securities |  |  | 658,371 |  |  |  | 15,292 |  |  |  | 5,239 |  |  |  | 668,424 |
Collateralized mortgage obligations |  |  | 10,201 |  |  |  | — |  |  |  | 74 |  |  |  | 10,127 |
Corporate debt securities |  |  | 93,545 |  |  |  | 526 |  |  |  | 549 |  |  |  | 93,522 |
Total |  | $ | 898,463 |  |  | $ | 16,534 |  |  | $ | 6,153 |  |  | $ | 908,844 |
|  | December 31, 2020 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 80,948 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 80,948 |
U.S. government agency entities |  |  | 99,944 |  |  |  | 441 |  |  |  | 546 |  |  |  | 99,839 |
Mortgage-backed securities |  |  | 709,709 |  |  |  | 17,965 |  |  |  | 606 |  |  |  | 727,068 |
Collateralized mortgage obligations |  |  | 10,358 |  |  |  | — |  |  |  | 34 |  |  |  | 10,324 |
Corporate debt securities |  |  | 118,271 |  |  |  | 367 |  |  |  | 267 |  |  |  | 118,371 |
Total |  | $ | 1,019,230 |  |  | $ | 18,779 |  |  | $ | 1,459 |  |  | $ | 1,036,550 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | March 31, 2021 |
|  | Securities Available-For-Sale |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 85,713 |  |  | $ | 85,764 |
Due after one year through five years |  |  | 35,967 |  |  |  | 35,481 |
Due after five years through ten years |  |  | 175,943 |  |  |  | 180,203 |
Due after ten years |  |  | 600,840 |  |  |  | 607,396 |
Total |  | $ | 898,463 |  |  | $ | 908,844 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | March 31, 2021 |
|  | 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. government agency entities |  | $ | 12,930 |  |  | $ | 11 |  |  | $ | 23,662 |  |  | $ | 280 |  |  | $ | 36,592 |  |  | $ | 291 |
Mortgage-backed securities |  |  | 190,914 |  |  |  | 4,638 |  |  |  | 7,903 |  |  |  | 601 |  |  |  | 198,817 |  |  |  | 5,239 |
Collateralized mortgage obligations |  |  | 9,946 |  |  |  | 65 |  |  |  | 181 |  |  |  | 9 |  |  |  | 10,127 |  |  |  | 74 |
Corporate debt securities |  |  | 39,451 |  |  |  | 549 |  |  |  | — |  |  |  | — |  |  |  | 39,451 |  |  |  | 549 |
Total |  | $ | 253,241 |  |  | $ | 5,263 |  |  | $ | 31,746 |  |  | $ | 890 |  |  | $ | 284,987 |  |  | $ | 6,153 |
|  | December 31, 2020 |
|  | 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 |  | $ | 40,952 |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |  |  | $ | 40,952 |  |  | $ | 6 |
U.S. government agency entities |  |  | 26,390 |  |  |  | 102 |  |  |  | 40,009 |  |  |  | 444 |  |  |  | 66,399 |  |  |  | 546 |
Mortgage-backed securities |  |  | 1,694 |  |  |  | 23 |  |  |  | 8,093 |  |  |  | 583 |  |  |  | 9,787 |  |  |  | 606 |
Collateralized mortgage obligations |  |  | 10,131 |  |  |  | 25 |  |  |  | 193 |  |  |  | 9 |  |  |  | 10,324 |  |  |  | 34 |
Corporate debt securities |  |  | 58,405 |  |  |  | 267 |  |  |  | — |  |  |  | — |  |  |  | 58,405 |  |  |  | 267 |
Total |  | $ | 137,572 |  |  | $ | 423 |  |  | $ | 48,295 |  |  | $ | 1,036 |  |  | $ | 185,867 |  |  | $ | 1,459 |

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