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Note 7 - Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2020 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 99,935 |  |  | $ | 1 |  |  | $ | 9 |  |  | $ | 99,927 |
U.S. government agency entities |  |  | 107,558 |  |  |  | 499 |  |  |  | 664 |  |  |  | 107,393 |
Mortgage-backed securities |  |  | 779,492 |  |  |  | 23,428 |  |  |  | 508 |  |  |  | 802,412 |
Collateralized mortgage obligations |  |  | 314 |  |  |  | — |  |  |  | 13 |  |  |  | 301 |
Corporate debt securities |  |  | 135,695 |  |  |  | 385 |  |  |  | 11 |  |  |  | 136,069 |
Total |  | $ | 1,122,994 |  |  | $ | 24,313 |  |  | $ | 1,205 |  |  | $ | 1,146,102 |
|  | December 31, 2019 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 74,926 |  |  | $ | 10 |  |  | $ | — |  |  | $ | 74,936 |
U.S. government agency entities |  |  | 90,452 |  |  |  | 663 |  |  |  | 319 |  |  |  | 90,796 |
U.S. government sponsored entities |  |  | 225,000 |  |  |  | — |  |  |  | 557 |  |  |  | 224,443 |
Mortgage-backed securities |  |  | 880,040 |  |  |  | 8,574 |  |  |  | 824 |  |  |  | 887,790 |
Collateralized mortgage obligations |  |  | 569 |  |  |  | — |  |  |  | 17 |  |  |  | 552 |
Corporate debt securities |  |  | 172,743 |  |  |  | 605 |  |  |  | 23 |  |  |  | 173,325 |
Total |  | $ | 1,443,730 |  |  | $ | 9,852 |  |  | $ | 1,740 |  |  | $ | 1,451,842 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | June 30, 2020 |
|  | Securities Available-For-Sale |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 181,868 |  |  | $ | 182,062 |
Due after one year through five years |  |  | 54,118 |  |  |  | 54,320 |
Due after five years through ten years |  |  | 155,525 |  |  |  | 157,920 |
Due after ten years |  |  | 731,483 |  |  |  | 751,800 |
Total |  | $ | 1,122,994 |  |  | $ | 1,146,102 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | June 30, 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 |  | $ | 59,969 |  |  | $ | 9 |  |  | $ | — |  |  | $ | — |  |  | $ | 59,969 |  |  | $ | 9 |
U.S. government agency entities |  |  | 48,739 |  |  |  | 419 |  |  |  | 15,476 |  |  |  | 245 |  |  |  | 64,215 |  |  |  | 664 |
Mortgage-backed securities |  |  | 1,440 |  |  |  | 10 |  |  |  | 9,921 |  |  |  | 498 |  |  |  | 11,361 |  |  |  | 508 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 301 |  |  |  | 13 |  |  |  | 301 |  |  |  | 13 |
Corporate debt securities |  |  | 38,537 |  |  |  | 11 |  |  |  | — |  |  |  | — |  |  |  | 38,537 |  |  |  | 11 |
Total |  | $ | 148,685 |  |  | $ | 449 |  |  | $ | 25,698 |  |  | $ | 756 |  |  | $ | 174,383 |  |  | $ | 1,205 |
|  | December 31, 2019 |
|  | 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 |  | $ | 48,829 |  |  | $ | 172 |  |  | $ | 3,570 |  |  | $ | 147 |  |  | $ | 52,399 |  |  | $ | 319 |
U.S. government sponsored entities |  |  | — |  |  |  | — |  |  |  | 224,443 |  |  |  | 557 |  |  |  | 224,443 |  |  |  | 557 |
Mortgage-backed securities |  |  | 43,719 |  |  |  | 36 |  |  |  | 120,801 |  |  |  | 788 |  |  |  | 164,520 |  |  |  | 824 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 552 |  |  |  | 17 |  |  |  | 552 |  |  |  | 17 |
Corporate debt securities |  |  | 51,791 |  |  |  | 23 |  |  |  | — |  |  |  | — |  |  |  | 51,791 |  |  |  | 23 |
Total |  | $ | 144,339 |  |  | $ | 231 |  |  | $ | 349,366 |  |  | $ | 1,509 |  |  | $ | 493,705 |  |  | $ | 1,740 |

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