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Note 3 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | 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 |
|  | As of 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] |
|  | Securities Available-for-Sale |
|  | As of December 31, 2021 |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 5,005 |  |  | $ | 5,009 |
Due after one year through five years |  |  | 126,871 |  |  |  | 124,148 |
Due after five years through ten years |  |  | 137,989 |  |  |  | 141,331 |
Due after ten years |  |  | 857,002 |  |  |  | 856,821 |
Total |  | $ | 1,126,867 |  |  | $ | 1,127,309 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | 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 |
|  | As of December 31, 2020 |
|  | 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 |  | $ | 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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