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Note 7 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | March 31, 2019 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 149,231 |  |  | $ | 20 |  |  | $ | 11 |  |  | $ | 149,240 |
U.S. government agency entities |  |  | 5,694 |  |  |  | 3 |  |  |  | 166 |  |  |  | 5,531 |
U.S. government sponsored entities |  |  | 400,000 |  |  |  | — |  |  |  | 6,726 |  |  |  | 393,274 |
Mortgage-backed securities |  |  | 701,761 |  |  |  | 2,391 |  |  |  | 8,191 |  |  |  | 695,961 |
Collateralized mortgage obligations |  |  | 905 |  |  |  | — |  |  |  | 24 |  |  |  | 881 |
Corporate debt securities |  |  | 64,988 |  |  |  | 211 |  |  |  | 233 |  |  |  | 64,966 |
Total |  | $ | 1,322,579 |  |  | $ | 2,625 |  |  | $ | 15,351 |  |  | $ | 1,309,853 |
|  | December 31, 2018 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 124,801 |  |  | $ | — |  |  | $ | 51 |  |  | $ | 124,750 |
U.S. government agency entities |  |  | 6,066 |  |  |  | — |  |  |  | 195 |  |  |  | 5,871 |
U.S. government sponsored entities |  |  | 400,000 |  |  |  | — |  |  |  | 11,637 |  |  |  | 388,363 |
Mortgage-backed securities |  |  | 670,874 |  |  |  | 960 |  |  |  | 15,089 |  |  |  | 656,745 |
Collateralized mortgage obligations |  |  | 1,005 |  |  |  | — |  |  |  | 28 |  |  |  | 977 |
Corporate debt securities |  |  | 64,985 |  |  |  | 818 |  |  |  | — |  |  |  | 65,803 |
Total |  | $ | 1,267,731 |  |  | $ | 1,778 |  |  | $ | 27,000 |  |  | $ | 1,242,509 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities Available-For-Sale |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 149,234 |  |  | $ | 149,243 |
Due after one year through five years |  |  | 465,744 |  |  |  | 459,017 |
Due after five years through ten years |  |  | 5,820 |  |  |  | 5,662 |
Due after ten years |  |  | 701,781 |  |  |  | 695,931 |
Total |  | $ | 1,322,579 |  |  | $ | 1,309,853 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | March 31, 2019 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 99,779 |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | 99,779 |  |  | $ | 11 |
U.S. government agency entities |  |  | — |  |  |  | — |  |  |  | 4,577 |  |  |  | 166 |  |  |  | 4,577 |  |  |  | 166 |
U.S. government sponsored entities |  |  | — |  |  |  | — |  |  |  | 393,274 |  |  |  | 6,726 |  |  |  | 393,274 |  |  |  | 6,726 |
Mortgage-backed securities |  |  | 3,437 |  |  |  | 18 |  |  |  | 511,556 |  |  |  | 8,173 |  |  |  | 514,993 |  |  |  | 8,191 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 881 |  |  |  | 24 |  |  |  | 881 |  |  |  | 24 |
Corporate debt securities |  |  | 39,767 |  |  |  | 233 |  |  |  | — |  |  |  | — |  |  |  | 39,767 |  |  |  | 233 |
Total |  | $ | 142,983 |  |  | $ | 262 |  |  | $ | 910,288 |  |  | $ | 15,089 |  |  | $ | 1,053,271 |  |  | $ | 15,351 |
|  | December 31, 2018 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 124,751 |  |  | $ | 51 |  |  | $ | — |  |  | $ | — |  |  | $ | 124,751 |  |  | $ | 51 |
U.S. government agency entities |  |  | 3,388 |  |  |  | 77 |  |  |  | 2,483 |  |  |  | 118 |  |  |  | 5,871 |  |  |  | 195 |
U.S. government sponsored entities |  |  | — |  |  |  | — |  |  |  | 388,362 |  |  |  | 11,637 |  |  |  | 388,362 |  |  |  | 11,637 |
Mortgage-backed securities |  |  | 48,528 |  |  |  | 502 |  |  |  | 507,701 |  |  |  | 14,587 |  |  |  | 556,229 |  |  |  | 15,089 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 977 |  |  |  | 28 |  |  |  | 977 |  |  |  | 28 |
Total |  | $ | 176,667 |  |  | $ | 630 |  |  | $ | 899,523 |  |  | $ | 26,370 |  |  | $ | 1,076,190 |  |  | $ | 27,000 |

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