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Note 6 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Cost Gross Unrealized Gains Gross Unrealized Losses and Fair Values of Investment [Table text Block] |
|  | March 31, 2014 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 475,139 |  |  | $ | 120 |  |  | $ | - |  |  | $ | 475,259 |
Mortgage-backed securities |  |  | 969,042 |  |  |  | 1,860 |  |  |  | 49,749 |  |  |  | 921,153 |
Collateralized mortgage obligations |  |  | 82 |  |  |  | - |  |  |  | 39 |  |  |  | 43 |
Corporate debt securities |  |  | 165,716 |  |  |  | 423 |  |  |  | 3,458 |  |  |  | 162,681 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 243 |  |  |  | 5,757 |
Preferred stock of government sponsored entities |  |  | 535 |  |  |  | 12,909 |  |  |  | - |  |  |  | 13,444 |
Other equity securities |  |  | 500 |  |  |  | 60 |  |  |  | - |  |  |  | 560 |
Total securities available-for-sale |  | $ | 1,617,014 |  |  | $ | 15,372 |  |  | $ | 53,489 |  |  | $ | 1,578,897 |
Total investment securities |  | $ | 1,617,014 |  |  | $ | 15,372 |  |  | $ | 53,489 |  |  | $ | 1,578,897 |
|  | December 31, 2013 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 460,095 |  |  | $ | 99 |  |  | $ | 1 |  |  | $ | 460,193 |
Mortgage-backed securities |  |  | 1,010,294 |  |  |  | 7,049 |  |  |  | 64,529 |  |  |  | 952,814 |
Collateralized mortgage obligations |  |  | 5,929 |  |  |  | 231 |  |  |  | 54 |  |  |  | 6,106 |
Asset-backed securities |  |  | 123 |  |  |  | - |  |  |  | - |  |  |  | 123 |
Corporate debt securities |  |  | 154,955 |  |  |  | 298 |  |  |  | 4,949 |  |  |  | 150,304 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 275 |  |  |  | 5,725 |
Preferred stock of government sponsored entities |  |  | 569 |  |  |  | 10,834 |  |  |  | - |  |  |  | 11,403 |
Total securities available-for-sale |  | $ | 1,637,965 |  |  | $ | 18,511 |  |  | $ | 69,808 |  |  | $ | 1,586,668 |
Total investment securities |  | $ | 1,637,965 |  |  | $ | 18,511 |  |  | $ | 69,808 |  |  | $ | 1,586,668 |
Schedule of Amortized Cost and Fair Value of Investment Securities by Contractual Maturities [Table Text Block] |
|  | Securities available-for-sale |
|  | Amortized cost |  |  | Fair value |
|  | (In thousands) |  |  |  |  |
Due in one year or less |  | $ | 385,848 |  |  | $ | 385,941 |
Due after one year through five years |  |  | 178,382 |  |  |  | 179,513 |
Due after five years through ten years |  |  | 100,805 |  |  |  | 98,143 |
Due after ten years (1) |  |  | 951,979 |  |  |  | 915,300 |
Total |  | $ | 1,617,014 |  |  | $ | 1,578,897 |
Fair Value, Unrealized Losses, and Number of Issuances of the Temporarily Impaired Securities [Table Text Block] |
|  | March 31, 2014 |
|  | Temporarily impaired securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (Dollars in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 888,606 |  |  | $ | 49,748 |  |  | $ | 151 |  |  | $ | 1 |  |  | $ | 888,757 |  |  | $ | 49,749 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 43 |  |  |  | 39 |  |  |  | 43 |  |  |  | 39 |
Corporate debt securities |  |  | 25,778 |  |  |  | 2 |  |  |  | 96,544 |  |  |  | 3,456 |  |  |  | 122,322 |  |  |  | 3,458 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 5,757 |  |  |  | 243 |  |  |  | 5,757 |  |  |  | 243 |
Total securities available-for-sale |  | $ | 914,384 |  |  | $ | 49,750 |  |  | $ | 102,495 |  |  | $ | 3,739 |  |  | $ | 1,016,879 |  |  | $ | 53,489 |
Total investment securities |  | $ | 914,384 |  |  | $ | 49,750 |  |  | $ | 102,495 |  |  | $ | 3,739 |  |  | $ | 1,016,879 |  |  | $ | 53,489 |
|  | December 31, 2013 |
|  | Temporarily impaired securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (Dollars in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 75,064 |  |  | $ | 1 |  |  | $ | - |  |  | $ | - |  |  | $ | 75,064 |  |  | $ | 1 |
Mortgage-backed securities |  |  | 792,012 |  |  |  | 64,526 |  |  |  | 272 |  |  |  | 2 |  |  |  | 792,284 |  |  |  | 64,528 |
Mortgage-backed securities-Non-agency |  |  | 94 |  |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | 94 |  |  |  | 1 |
Collateralized mortgage obligations |  |  | 68 |  |  |  | 4 |  |  |  | 301 |  |  |  | 50 |  |  |  | 369 |  |  |  | 54 |
Corporate debt securities |  |  | 9,970 |  |  |  | 30 |  |  |  | 100,081 |  |  |  | 4,919 |  |  |  | 110,051 |  |  |  | 4,949 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 5,724 |  |  |  | 275 |  |  |  | 5,724 |  |  |  | 275 |
Total securities available-for-sale |  | $ | 877,208 |  |  | $ | 64,562 |  |  | $ | 106,378 |  |  | $ | 5,246 |  |  | $ | 983,586 |  |  | $ | 69,808 |
Total investment securities |  | $ | 877,208 |  |  | $ | 64,562 |  |  | $ | 106,378 |  |  | $ | 5,246 |  |  | $ | 983,586 |  |  | $ | 69,808 |

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