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Note 4 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | As of 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 securities available-for-sale |  | $ | 1,317,012 |  |  | $ | 12,301 |  |  | $ | 14,968 |  |  | $ | 1,314,345 |
|  | As of December 31, 2015 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 284,678 |  |  | $ | 5 |  |  | $ | 395 |  |  | $ | 284,288 |
U.S. government sponsored entities |  |  | 150,000 |  |  |  | - |  |  |  | 1,840 |  |  |  | 148,160 |
Mortgage-backed securities |  |  | 1,073,108 |  |  |  | 560 |  |  |  | 11,399 |  |  |  | 1,062,269 |
Collateralized mortgage obligations |  |  | 63 |  |  |  | - |  |  |  | 27 |  |  |  | 36 |
Corporate debt securities |  |  | 74,955 |  |  |  | 425 |  |  |  | 1,525 |  |  |  | 73,855 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 167 |  |  |  | 5,833 |
Preferred stock of government sponsored entities |  |  | 2,811 |  |  |  | 633 |  |  |  | 228 |  |  |  | 3,216 |
Other equity securities |  |  | 4,108 |  |  |  | 4,929 |  |  |  | 342 |  |  |  | 8,695 |
Total securities available-for-sale |  | $ | 1,595,723 |  |  | $ | 6,552 |  |  | $ | 15,923 |  |  | $ | 1,586,352 |
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 |  | $ | 339,879 |  |  | $ | 339,823 |
Due after one year through five years |  |  | 553,130 |  |  |  | 544,585 |
Due after five years through ten years |  |  | 75,111 |  |  |  | 72,733 |
Due after ten years (1) |  |  | 348,892 |  |  |  | 357,204 |
Total |  | $ | 1,317,012 |  |  | $ | 1,314,345 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | As of December 31, 2016 |
|  | Temporarily Impaired Securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |  |  | No. of |
|  | Value |  |  | Losses |  |  | Issuances |  |  | Value |  |  | Losses |  |  | Issuances |  |  | Value |  |  | Losses |  |  | Issuances |
|  | (Dollars in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 299,088 |  |  | $ | 857 |  |  |  | 6 |  |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 299,088 |  |  | $ | 857 |  |  |  | 6 |
U.S. government sponsored entities |  |  | 390,331 |  |  |  | 9,669 |  |  |  | 8 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 390,331 |  |  |  | 9,669 |  |  |  | 8 |
Mortgage-backed securities |  |  | 328,236 |  |  |  | 3,288 |  |  |  | 16 |  |  |  | 62 |  |  |  | 2 |  |  |  | 3 |  |  |  | 328,298 |  |  |  | 3,290 |  |  |  | 19 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 28 |  |  |  | 20 |  |  |  | 1 |  |  |  | 28 |  |  |  | 20 |  |  |  | 1 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 29,138 |  |  |  | 862 |  |  |  | 2 |  |  |  | 29,138 |  |  |  | 862 |  |  |  | 2 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 6,230 |  |  |  | 270 |  |  |  | 1 |  |  |  | 6,230 |  |  |  | 270 |  |  |  | 1 |
Total securities available-for-sale |  | $ | 1,017,655 |  |  | $ | 13,814 |  |  |  | 30 |  |  | $ | 35,458 |  |  | $ | 1,154 |  |  |  | 7 |  |  | $ | 1,053,113 |  |  | $ | 14,968 |  |  |  | 37 |
|  | As of December 31, 2015 |
|  | Temporarily Impaired Securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |  |  | No. of |
|  | Value |  |  | Losses |  |  | Issuances |  |  | Value |  |  | Losses |  |  | Issuances |  |  | Value |  |  | Losses |  |  | Issuances |
|  | (Dollars in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 224,289 |  |  | $ | 395 |  |  |  | 5 |  |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 224,289 |  |  | $ | 395 |  |  |  | 5 |
U.S. government sponsored entities |  |  | 148,160 |  |  |  | 1,840 |  |  |  | 3 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 148,160 |  |  |  | 1,840 |  |  |  | 3 |
Mortgage-backed securities |  |  | 1,025,342 |  |  |  | 11,398 |  |  |  | 35 |  |  |  | 6 |  |  |  | 1 |  |  |  | 2 |  |  |  | 1,025,348 |  |  |  | 11,399 |  |  |  | 37 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 36 |  |  |  | 27 |  |  |  | 1 |  |  |  | 36 |  |  |  | 27 |  |  |  | 1 |
Corporate debt securities |  |  | 9,950 |  |  |  | 50 |  |  |  | 1 |  |  |  | 43,525 |  |  |  | 1,475 |  |  |  | 3 |  |  |  | 53,475 |  |  |  | 1,525 |  |  |  | 4 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 5,833 |  |  |  | 167 |  |  |  | 1 |  |  |  | 5,833 |  |  |  | 167 |  |  |  | 1 |
Preferred stock of government sponsored entities |  |  | 2,488 |  |  |  | 228 |  |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 2,488 |  |  |  | 228 |  |  |  | 2 |
Other equity securities |  |  | 158 |  |  |  | 342 |  |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 158 |  |  |  | 342 |  |  |  | 1 |
Total securities available-for-sale |  | $ | 1,410,387 |  |  | $ | 14,253 |  |  |  | 47 |  |  | $ | 49,400 |  |  | $ | 1,670 |  |  |  | 7 |  |  | $ | 1,459,787 |  |  | $ | 15,923 |  |  |  | 54 |

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