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Note 6 - Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract] |
|  | June 30, 2013 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 409,849 |  |  | $ | 192 |  |  | $ | 6 |  |  | $ | 410,035 |
Mortgage-backed securities |  |  | 1,430,373 |  |  |  | 20,153 |  |  |  | 45,178 |  |  |  | 1,405,348 |
Collateralized mortgage obligations |  |  | 7,438 |  |  |  | 295 |  |  |  | 65 |  |  |  | 7,668 |
Asset-backed securities |  |  | 132 |  |  |  | 1 |  |  |  | - |  |  |  | 133 |
Corporate debt securities |  |  | 189,951 |  |  |  | 415 |  |  |  | 7,540 |  |  |  | 182,826 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 161 |  |  |  | 5,839 |
Preferred stock of government sponsored entities |  |  | 569 |  |  |  | 5,887 |  |  |  | - |  |  |  | 6,456 |
Total securities available-for-sale |  | $ | 2,044,312 |  |  | $ | 26,943 |  |  | $ | 52,950 |  |  | $ | 2,018,305 |
Total investment securities |  | $ | 2,044,312 |  |  | $ | 26,943 |  |  | $ | 52,950 |  |  | $ | 2,018,305 |
|  | December 31, 2012 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and municipal securities |  | $ | 129,037 |  |  | $ | 9,268 |  |  | $ | - |  |  | $ | 138,305 |
Mortgage-backed securities |  |  | 634,757 |  |  |  | 40,801 |  |  |  | - |  |  |  | 675,558 |
Corporate debt securities |  |  | 9,974 |  |  |  | 69 |  |  |  | - |  |  |  | 10,043 |
Total securities held-to-maturity |  | $ | 773,768 |  |  | $ | 50,138 |  |  | $ | - |  |  | $ | 823,906 |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 509,748 |  |  | $ | 228 |  |  | $ | 5 |  |  | $ | 509,971 |
Mortgage-backed securities |  |  | 404,505 |  |  |  | 12,194 |  |  |  | 5 |  |  |  | 416,694 |
Collateralized mortgage obligations |  |  | 9,772 |  |  |  | 430 |  |  |  | 34 |  |  |  | 10,168 |
Asset-backed securities |  |  | 145 |  |  |  | - |  |  |  | 4 |  |  |  | 141 |
Corporate debt securities |  |  | 349,973 |  |  |  | 106 |  |  |  | 14,102 |  |  |  | 335,977 |
Mutual funds |  |  | 6,000 |  |  |  | 79 |  |  |  | - |  |  |  | 6,079 |
Preferred stock of government sponsored entities |  |  | 569 |  |  |  | 1,766 |  |  |  | - |  |  |  | 2,335 |
Trust preferred securities |  |  | 9,964 |  |  |  | 151 |  |  |  | - |  |  |  | 10,115 |
Total securities available-for-sale |  | $ | 1,290,676 |  |  | $ | 14,954 |  |  | $ | 14,150 |  |  | $ | 1,291,480 |
Total investment securities |  | $ | 2,064,444 |  |  | $ | 65,092 |  |  | $ | 14,150 |  |  | $ | 2,115,386 |
|  | Securities available-for-sale |
|  | Amortized cost |  |  | Fair value |
|  | (In thousands) |  |  |  |  |
Due in one year or less |  | $ | 309,963 |  |  | $ | 310,155 |
Due after one year through five years |  |  | 185,177 |  |  |  | 183,982 |
Due after five years through ten years |  |  | 152,342 |  |  |  | 149,019 |
Due after ten years (1) |  |  | 1,396,830 |  |  |  | 1,375,149 |
Total |  | $ | 2,044,312 |  |  | $ | 2,018,305 |
|  | June 30, 2013 |
|  | Temporarily impaired securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 99,918 |  |  | $ | 6 |  |  | $ | - |  |  | $ | - |  |  | $ | 99,918 |  |  | $ | 6 |
Mortgage-backed securities |  |  | 901,227 |  |  |  | 45,174 |  |  |  | 160 |  |  |  | 2 |  |  |  | 901,387 |  |  |  | 45,176 |
Mortgage-backed securities-Non-agency |  |  | 94 |  |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | 94 |  |  |  | 2 |
Collateralized mortgage obligations |  |  | 67 |  |  |  | 2 |  |  |  | 332 |  |  |  | 63 |  |  |  | 399 |  |  |  | 65 |
Corporate debt securities |  |  | 9,758 |  |  |  | 242 |  |  |  | 152,702 |  |  |  | 7,298 |  |  |  | 162,460 |  |  |  | 7,540 |
Mutual funds |  |  | 5,839 |  |  |  | 161 |  |  |  | - |  |  |  | - |  |  |  | 5,839 |  |  |  | 161 |
Total securities available-for-sale |  | $ | 1,016,903 |  |  | $ | 45,587 |  |  | $ | 153,194 |  |  | $ | 7,363 |  |  | $ | 1,170,097 |  |  | $ | 52,950 |
Total investment securities |  | $ | 1,016,903 |  |  | $ | 45,587 |  |  | $ | 153,194 |  |  | $ | 7,363 |  |  | $ | 1,170,097 |  |  | $ | 52,950 |
|  | December 31, 2012 |
|  | Temporarily impaired securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
|  | (Dollars in thousands) |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total securities held-to-maturity |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 49,969 |  |  | $ | 5 |  |  | $ | - |  |  | $ | - |  |  | $ | 49,969 |  |  | $ | 5 |
Mortgage-backed securities |  |  | 231 |  |  |  | 1 |  |  |  | 170 |  |  |  | 1 |  |  |  | 401 |  |  |  | 2 |
Mortgage-backed securities-Non-agency |  |  | - |  |  |  | - |  |  |  | 96 |  |  |  | 2 |  |  |  | 96 |  |  |  | 2 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 439 |  |  |  | 35 |  |  |  | 439 |  |  |  | 35 |
Asset-backed securities |  |  | - |  |  |  | - |  |  |  | 141 |  |  |  | 4 |  |  |  | 141 |  |  |  | 4 |
Corporate debt securities |  |  | 52,468 |  |  |  | 2,532 |  |  |  | 253,430 |  |  |  | 11,570 |  |  |  | 305,898 |  |  |  | 14,102 |
Total securities available-for-sale |  | $ | 102,668 |  |  | $ | 2,538 |  |  | $ | 254,276 |  |  | $ | 11,612 |  |  | $ | 356,944 |  |  | $ | 14,150 |
Total investment securities |  | $ | 102,668 |  |  | $ | 2,538 |  |  | $ | 254,276 |  |  | $ | 11,612 |  |  | $ | 356,944 |  |  | $ | 14,150 |

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