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Note 6 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2017
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | March 31, 2017 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 419,881 |  |  | $ | - |  |  | $ | 411 |  |  | $ | 419,470 |
U.S. government sponsored entities |  |  | 400,000 |  |  |  | - |  |  |  | 8,014 |  |  |  | 391,986 |
Mortgage-backed securities |  |  | 323,017 |  |  |  | 268 |  |  |  | 3,124 |  |  |  | 320,161 |
Corporate debt securities |  |  | 74,968 |  |  |  | 378 |  |  |  | 335 |  |  |  | 75,011 |
Mutual funds |  |  | 6,500 |  |  |  | - |  |  |  | 270 |  |  |  | 6,230 |
Preferred stock of government sponsored entities |  |  | 2,811 |  |  |  | 3,167 |  |  |  | - |  |  |  | 5,978 |
Other equity securities |  |  | 3,608 |  |  |  | 5,285 |  |  |  | - |  |  |  | 8,893 |
Total |  | $ | 1,230,785 |  |  | $ | 9,098 |  |  | $ | 12,154 |  |  | $ | 1,227,729 |
|  | December 31, 2016 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 489,839 |  |  | $ | 35 |  |  | $ | 857 |  |  | $ | 489,017 |
U.S. government sponsored entities |  |  | 400,000 |  |  |  | - |  |  |  | 9,669 |  |  |  | 390,331 |
Mortgage-backed securities |  |  | 339,241 |  |  |  | 309 |  |  |  | 3,290 |  |  |  | 336,260 |
Collateralized mortgage obligations |  |  | 48 |  |  |  | - |  |  |  | 20 |  |  |  | 28 |
Corporate debt securities |  |  | 74,965 |  |  |  | 247 |  |  |  | 862 |  |  |  | 74,350 |
Mutual funds |  |  | 6,500 |  |  |  | - |  |  |  | 270 |  |  |  | 6,230 |
Preferred stock of government sponsored entities |  |  | 2,811 |  |  |  | 4,497 |  |  |  | - |  |  |  | 7,308 |
Other equity securities |  |  | 3,608 |  |  |  | 7,213 |  |  |  | - |  |  |  | 10,821 |
Total |  | $ | 1,317,012 |  |  | $ | 12,301 |  |  | $ | 14,968 |  |  | $ | 1,314,345 |
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 |  | $ | 370,028 |  |  | $ | 369,892 |
Due after one year through five years |  |  | 527,354 |  |  |  | 519,205 |
Due after five years through ten years |  |  | 103 |  |  |  | 111 |
Due after ten years (1) |  |  | 333,300 |  |  |  | 338,521 |
Total |  | $ | 1,230,785 |  |  | $ | 1,227,729 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | March 31, 2017 |
|  | Temporarily impaired securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 419,470 |  |  | $ | 411 |  |  | $ | - |  |  | $ | - |  |  | $ | 419,470 |  |  | $ | 411 |
U.S. government sponsored entities |  |  | 391,986 |  |  |  | 8,014 |  |  |  | - |  |  |  | - |  |  |  | 391,986 |  |  |  | 8,014 |
Mortgage-backed securities |  |  | 314,395 |  |  |  | 3,120 |  |  |  | 58 |  |  |  | 3 |  |  |  | 314,453 |  |  |  | 3,123 |
Corporate debt securities |  |  | 4,993 |  |  |  | 7 |  |  |  | 29,671 |  |  |  | 329 |  |  |  | 34,664 |  |  |  | 336 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 6,230 |  |  |  | 270 |  |  |  | 6,230 |  |  |  | 270 |
Total |  | $ | 1,130,844 |  |  | $ | 11,552 |  |  | $ | 35,959 |  |  | $ | 602 |  |  | $ | 1,166,803 |  |  | $ | 12,154 |
|  | December 31, 2016 |
|  | Temporarily impaired securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 299,088 |  |  | $ | 857 |  |  | $ | - |  |  | $ | - |  |  | $ | 299,088 |  |  | $ | 857 |
U.S. government sponsored entities |  |  | 390,331 |  |  |  | 9,669 |  |  |  | - |  |  |  | - |  |  |  | 390,331 |  |  |  | 9,669 |
Mortgage-backed securities |  |  | 328,236 |  |  |  | 3,288 |  |  |  | 62 |  |  |  | 2 |  |  |  | 328,298 |  |  |  | 3,290 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 28 |  |  |  | 20 |  |  |  | 28 |  |  |  | 20 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | 29,138 |  |  |  | 862 |  |  |  | 29,138 |  |  |  | 862 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 6,230 |  |  |  | 270 |  |  |  | 6,230 |  |  |  | 270 |
Total |  | $ | 1,017,655 |  |  | $ | 13,814 |  |  | $ | 35,458 |  |  | $ | 1,154 |  |  | $ | 1,053,113 |  |  | $ | 14,968 |

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