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Note 6 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2013
|  | March 31, 2013 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 359,880 |  |  | $ | 234 |  |  | $ | - |  |  | $ | 360,114 |
State and municipal securities |  |  | 59,805 |  |  |  | 3,653 |  |  |  | - |  |  |  | 63,458 |
Mortgage-backed securities |  |  | 1,449,816 |  |  |  | 42,335 |  |  |  | 1,553 |  |  |  | 1,490,598 |
Collateralized mortgage obligations |  |  | 8,631 |  |  |  | 369 |  |  |  | 54 |  |  |  | 8,946 |
Asset-backed securities |  |  | 136 |  |  |  | - |  |  |  | 4 |  |  |  | 132 |
Corporate debt securities |  |  | 264,949 |  |  |  | 657 |  |  |  | 9,149 |  |  |  | 256,457 |
Mutual funds |  |  | 6,000 |  |  |  | 48 |  |  |  | 13 |  |  |  | 6,035 |
Preferred stock of government sponsored entities |  |  | 569 |  |  |  | 3,987 |  |  |  | - |  |  |  | 4,556 |
Total securities available-for-sale |  | $ | 2,149,786 |  |  | $ | 51,283 |  |  | $ | 10,773 |  |  | $ | 2,190,296 |
Total investment securities |  | $ | 2,149,786 |  |  | $ | 51,283 |  |  | $ | 10,773 |  |  | $ | 2,190,296 |
|  | 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 |  | $ | 299,974 |  |  | $ | 300,139 |
Due after one year through five years |  |  | 186,517 |  |  |  | 184,546 |
Due after five years through ten years |  |  | 222,033 |  |  |  | 221,132 |
Due after ten years (1) |  |  | 1,441,262 |  |  |  | 1,484,479 |
Total |  | $ | 2,149,786 |  |  | $ | 2,190,296 |
|  | March 31, 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 |  | $ | 321,604 |  |  | $ | 1,551 |  |  | $ | 163 |  |  | $ | 1 |  |  | $ | 321,767 |  |  | $ | 1,552 |
Mortgage-backed securities-Non-agency |  |  | - |  |  |  | - |  |  |  | 96 |  |  |  | 1 |  |  |  | 96 |  |  |  | 1 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 417 |  |  |  | 54 |  |  |  | 417 |  |  |  | 54 |
Asset-backed securities |  |  | - |  |  |  | - |  |  |  | 132 |  |  |  | 4 |  |  |  | 132 |  |  |  | 4 |
Corporate debt securities |  |  | 9,855 |  |  |  | 145 |  |  |  | 195,996 |  |  |  | 9,004 |  |  |  | 205,851 |  |  |  | 9,149 |
Mutual funds |  |  | 1,987 |  |  |  | 13 |  |  |  | - |  |  |  | - |  |  |  | 1,987 |  |  |  | 13 |
Total securities available-for-sale |  | $ | 333,446 |  |  | $ | 1,709 |  |  | $ | 196,804 |  |  | $ | 9,064 |  |  | $ | 530,250 |  |  | $ | 10,773 |
Total investment securities |  | $ | 333,446 |  |  | $ | 1,709 |  |  | $ | 196,804 |  |  | $ | 9,064 |  |  | $ | 530,250 |  |  | $ | 10,773 |
|  | 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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- Definition Schedule of Amortized Cost and Fair Value of Investment Securities by Contractual Maturities [Table Text Block] + References No definition available. + Details
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- Definition Schedule of Amortized Cost Gross Unrealized Gains Gross Unrealized Losses and Fair Values of Investment [Table text Block] + References No definition available. + Details
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