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Note 6 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract] |
|  | September 30, 2013 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 460,119 |  |  | $ | 214 |  |  | $ | - |  |  | $ | 460,333 |
Mortgage-backed securities |  |  | 1,131,602 |  |  |  | 9,364 |  |  |  | 45,947 |  |  |  | 1,095,019 |
Collateralized mortgage obligations |  |  | 6,489 |  |  |  | 268 |  |  |  | 60 |  |  |  | 6,697 |
Asset-backed securities |  |  | 127 |  |  |  | 1 |  |  |  | - |  |  |  | 128 |
Corporate debt securities |  |  | 174,953 |  |  |  | 186 |  |  |  | 7,299 |  |  |  | 167,840 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 188 |  |  |  | 5,812 |
Preferred stock of government sponsored entities |  |  | 569 |  |  |  | 6,911 |  |  |  | - |  |  |  | 7,480 |
Total securities available-for-sale |  | $ | 1,779,859 |  |  | $ | 16,944 |  |  | $ | 53,494 |  |  | $ | 1,743,309 |
Total investment securities |  | $ | 1,779,859 |  |  | $ | 16,944 |  |  | $ | 53,494 |  |  | $ | 1,743,309 |
|  | 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 |  | $ | 460,141 |  |  | $ | 460,355 |
Due after one year through five years |  |  | 98,079 |  |  |  | 98,283 |
Due after five years through ten years |  |  | 119,240 |  |  |  | 114,235 |
Due after ten years (1) |  |  | 1,102,399 |  |  |  | 1,070,436 |
Total |  | $ | 1,779,859 |  |  | $ | 1,743,309 |
|  | September 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 882,851 |  |  | $ | 45,944 |  |  | $ | 154 |  |  | $ | 2 |  |  | $ | 883,005 |  |  | $ | 45,946 |
Mortgage-backed securities-Non-agency |  |  | 94 |  |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | 94 |  |  |  | 1 |
Collateralized mortgage obligations |  |  | 68 |  |  |  | 1 |  |  |  | 332 |  |  |  | 59 |  |  |  | 400 |  |  |  | 60 |
Corporate debt securities |  |  | 9,984 |  |  |  | 16 |  |  |  | 122,717 |  |  |  | 7,283 |  |  |  | 132,701 |  |  |  | 7,299 |
Mutual funds |  |  | 5,812 |  |  |  | 188 |  |  |  | - |  |  |  | - |  |  |  | 5,812 |  |  |  | 188 |
Total securities available-for-sale |  | $ | 898,809 |  |  | $ | 46,150 |  |  | $ | 123,203 |  |  | $ | 7,344 |  |  | $ | 1,022,012 |  |  | $ | 53,494 |
Total investment securities |  | $ | 898,809 |  |  | $ | 46,150 |  |  | $ | 123,203 |  |  | $ | 7,344 |  |  | $ | 1,022,012 |  |  | $ | 53,494 |
|  | 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 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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