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Note 4 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2012
|  | At 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 |
|  | At December 31, 2011 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Held-to-Maturity |  | (In thousands) |
U.S. government sponsored entities |  | $ | 99,966 |  |  | $ | 1,406 |  |  | $ | - |  |  | $ | 101,372 |
State and municipal securities |  |  | 129,577 |  |  |  | 7,053 |  |  |  | - |  |  |  | 136,630 |
Mortgage-backed securities |  |  | 913,990 |  |  |  | 42,351 |  |  |  | - |  |  |  | 956,341 |
Corporate debt securities |  |  | 9,971 |  |  |  | - |  |  |  | 337 |  |  |  | 9,634 |
Total securities held-to-maturity |  | $ | 1,153,504 |  |  | $ | 50,810 |  |  | $ | 337 |  |  | $ | 1,203,977 |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entities |  | $ | 500,007 |  |  | $ | 1,226 |  |  | $ | 7 |  |  | $ | 501,226 |
State and municipal securities |  |  | 1,869 |  |  |  | 59 |  |  |  | - |  |  |  | 1,928 |
Mortgage-backed securities |  |  | 325,706 |  |  |  | 12,361 |  |  |  | 436 |  |  |  | 337,631 |
Collateralized mortgage obligations |  |  | 16,184 |  |  |  | 540 |  |  |  | 238 |  |  |  | 16,486 |
Asset-backed securities |  |  | 172 |  |  |  | - |  |  |  | 6 |  |  |  | 166 |
Corporate debt securities |  |  | 412,045 |  |  |  | 113 |  |  |  | 31,729 |  |  |  | 380,429 |
Mutual funds |  |  | 6,000 |  |  |  | 48 |  |  |  | 13 |  |  |  | 6,035 |
Preferred stock of government sponsored entities |  |  | 569 |  |  |  | 1,085 |  |  |  | - |  |  |  | 1,654 |
Trust preferred securities |  |  | 45,501 |  |  |  | 486 |  |  |  | 24 |  |  |  | 45,963 |
Other equity securities |  |  | 1,468 |  |  |  | 1,492 |  |  |  | - |  |  |  | 2,960 |
Total securities available-for-sale |  | $ | 1,309,521 |  |  | $ | 17,410 |  |  | $ | 32,453 |  |  | $ | 1,294,478 |
Total investment securities |  | $ | 2,463,025 |  |  | $ | 68,220 |  |  | $ | 32,790 |  |  | $ | 2,498,455 |
|  | Securities Available-for-Sale |  |  | Securities Held-to-Maturity |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 349,899 |  |  | $ | 349,940 |  |  | $ | - |  |  | $ | - |
Due after one year through five years |  |  | 375,041 |  |  |  | 370,241 |  |  |  | - |  |  |  | - |
Due after five years through ten years |  |  | 194,901 |  |  |  | 190,047 |  |  |  | 62,235 |  |  |  | 66,523 |
Due after ten years (1) |  |  | 370,835 |  |  |  | 381,252 |  |  |  | 711,533 |  |  |  | 757,383 |
Total |  | $ | 1,290,676 |  |  | $ | 1,291,480 |  |  | $ | 773,768 |  |  | $ | 823,906 |
|  | As of December 31, 2012 |
|  | Temporarily Impaired Securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |  |  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |  |  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |
|  | (Dollars in thousands) |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total securities held-to-maturity |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | - |  |  | $ | - |  |  |  | - |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 49,969 |  |  | $ | 5 |  |  |  | 1 |  |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 49,969 |  |  | $ | 5 |  |  |  | 1 |
Mortgage-backed securities |  |  | 231 |  |  |  | 1 |  |  |  | 2 |  |  |  | 170 |  |  |  | 1 |  |  |  | 6 |  |  |  | 401 |  |  |  | 2 |  |  |  | 8 |
Mortgage-backed securities-Non-agency |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 96 |  |  |  | 2 |  |  |  | 1 |  |  |  | 96 |  |  |  | 2 |  |  |  | 1 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 439 |  |  |  | 35 |  |  |  | 4 |  |  |  | 439 |  |  |  | 35 |  |  |  | 4 |
Asset-backed securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 141 |  |  |  | 4 |  |  |  | 1 |  |  |  | 141 |  |  |  | 4 |  |  |  | 1 |
Corporate debt securities |  |  | 52,468 |  |  |  | 2,532 |  |  |  | 4 |  |  |  | 253,430 |  |  |  | 11,570 |  |  |  | 22 |  |  |  | 305,898 |  |  |  | 14,102 |  |  |  | 26 |
Total securities available-for-sale |  | $ | 102,668 |  |  | $ | 2,538 |  |  |  | 7 |  |  | $ | 254,276 |  |  | $ | 11,612 |  |  |  | 34 |  |  | $ | 356,944 |  |  | $ | 14,150 |  |  |  | 41 |
Total investment securities |  | $ | 102,668 |  |  | $ | 2,538 |  |  |  | 7 |  |  | $ | 254,276 |  |  | $ | 11,612 |  |  |  | 34 |  |  | $ | 356,944 |  |  | $ | 14,150 |  |  |  | 41 |
|  | As of December 31, 2011 |
|  | Temporarily Impaired Securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |  |  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |  |  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |
|  | (Dollars in thousands) |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 9,635 |  |  | $ | 337 |  |  |  | 1 |  |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 9,635 |  |  | $ | 337 |  |  |  | 1 |
Total securities held-to-maturity |  | $ | 9,635 |  |  | $ | 337 |  |  |  | 1 |  |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 9,635 |  |  | $ | 337 |  |  |  | 1 |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entities |  | $ | 49,993 |  |  | $ | 7 |  |  |  | 1 |  |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 49,993 |  |  | $ | 7 |  |  |  | 1 |
Mortgage-backed securities |  |  | 564 |  |  |  | 4 |  |  |  | 8 |  |  |  | 35 |  |  |  | 1 |  |  |  | 2 |  |  |  | 599 |  |  |  | 5 |  |  |  | 10 |
Mortgage-backed securities-Non-agency |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 6,719 |  |  |  | 431 |  |  |  | 2 |  |  |  | 6,719 |  |  |  | 431 |  |  |  | 2 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 570 |  |  |  | 238 |  |  |  | 4 |  |  |  | 570 |  |  |  | 238 |  |  |  | 4 |
Asset-backed securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 166 |  |  |  | 6 |  |  |  | 1 |  |  |  | 166 |  |  |  | 6 |  |  |  | 1 |
Corporate debt securities |  |  | 185,577 |  |  |  | 14,201 |  |  |  | 17 |  |  |  | 172,857 |  |  |  | 17,528 |  |  |  | 19 |  |  |  | 358,434 |  |  |  | 31,729 |  |  |  | 36 |
Mutual funds |  |  | 1,987 |  |  |  | 13 |  |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1,987 |  |  |  | 13 |  |  |  | 1 |
Trust preferred securities |  |  | 5,674 |  |  |  | 24 |  |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 5,674 |  |  |  | 24 |  |  |  | 2 |
Total securities available-for-sale |  | $ | 243,795 |  |  | $ | 14,249 |  |  |  | 29 |  |  | $ | 180,347 |  |  | $ | 18,204 |  |  |  | 28 |  |  | $ | 424,142 |  |  | $ | 32,453 |  |  |  | 57 |
Total investment securities |  | $ | 253,430 |  |  | $ | 14,586 |  |  |  | 30 |  |  | $ | 180,347 |  |  | $ | 18,204 |  |  |  | 28 |  |  | $ | 433,777 |  |  | $ | 32,790 |  |  |  | 58 |

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- Definition Fair Value, Unrealized Losses, and Number of Issuances of the Temporarily Impaired Securities [Table Text Block] + References No definition available. + Details
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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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