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Note 6 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | March 31, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 224,750 |  |  | $ | 61 |  |  | $ | 7 |  |  | $ | 224,804 |
U.S. government sponsored entities |  |  | 100,000 |  |  |  | 10 |  |  |  | - |  |  |  | 100,010 |
Mortgage-backed securities |  |  | 1,063,944 |  |  |  | 6,553 |  |  |  | 4 |  |  |  | 1,070,493 |
Collateralized mortgage obligations |  |  | 60 |  |  |  | - |  |  |  | 26 |  |  |  | 34 |
Corporate debt securities |  |  | 74,957 |  |  |  | 413 |  |  |  | 2,267 |  |  |  | 73,103 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 85 |  |  |  | 5,915 |
Preferred stock of government sponsored entities |  |  | 2,811 |  |  |  | 478 |  |  |  | 486 |  |  |  | 2,803 |
Other equity securities |  |  | 3,902 |  |  |  | 4,060 |  |  |  | - |  |  |  | 7,962 |
Total |  | $ | 1,476,424 |  |  | $ | 11,575 |  |  | $ | 2,875 |  |  | $ | 1,485,124 |
|  | December 31, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 284,678 |  |  | $ | 5 |  |  | $ | 395 |  |  | $ | 284,288 |
U.S. government sponsored entities |  |  | 150,000 |  |  |  | - |  |  |  | 1,840 |  |  |  | 148,160 |
Mortgage-backed securities |  |  | 1,073,108 |  |  |  | 560 |  |  |  | 11,399 |  |  |  | 1,062,269 |
Collateralized mortgage obligations |  |  | 63 |  |  |  | - |  |  |  | 27 |  |  |  | 36 |
Corporate debt securities |  |  | 74,955 |  |  |  | 425 |  |  |  | 1,525 |  |  |  | 73,855 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 167 |  |  |  | 5,833 |
Preferred stock of government sponsored entities |  |  | 2,811 |  |  |  | 633 |  |  |  | 228 |  |  |  | 3,216 |
Other equity securities |  |  | 4,108 |  |  |  | 4,929 |  |  |  | 342 |  |  |  | 8,695 |
Total |  | $ | 1,595,723 |  |  | $ | 6,552 |  |  | $ | 15,923 |  |  | $ | 1,586,352 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities Available-For-Sale |
|  | Amortized cost |  |  | Fair value |
|  | (In thousands) |
Due in one year or less |  | $ | 154,963 |  |  | $ | 154,978 |
Due after one year through five years |  |  | 104,879 |  |  |  | 105,470 |
Due after five years through ten years |  |  | 145,501 |  |  |  | 143,358 |
Due after ten years (1) |  |  | 1,071,081 |  |  |  | 1,081,318 |
Total |  | $ | 1,476,424 |  |  | $ | 1,485,124 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | March 31, 2016 |
|  | 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 |  | $ | 29,965 |  |  | $ | 7 |  |  | $ | - |  |  | $ | - |  |  | $ | 29,965 |  |  | $ | 7 |
Mortgage-backed securities |  |  | 389 |  |  |  | 3 |  |  |  | 46 |  |  |  | 1 |  |  |  | 435 |  |  |  | 4 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 34 |  |  |  | 26 |  |  |  | 34 |  |  |  | 26 |
Corporate debt securities |  |  | 9,950 |  |  |  | 50 |  |  |  | 42,783 |  |  |  | 2,217 |  |  |  | 52,733 |  |  |  | 2,267 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 5,915 |  |  |  | 85 |  |  |  | 5,915 |  |  |  | 85 |
Preferred stock of government sponsored entities |  |  | 2,230 |  |  |  | 486 |  |  |  | - |  |  |  | - |  |  |  | 2,230 |  |  |  | 486 |
Total |  | $ | 42,534 |  |  | $ | 546 |  |  | $ | 48,778 |  |  | $ | 2,329 |  |  | $ | 91,312 |  |  | $ | 2,875 |
|  | December 31, 2015 |
|  | 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 |  | $ | 224,289 |  |  | $ | 395 |  |  | $ | - |  |  | $ | - |  |  | $ | 224,289 |  |  | $ | 395 |
U.S. government sponsored entities |  |  | 148,160 |  |  |  | 1,840 |  |  |  | - |  |  |  | - |  |  |  | 148,160 |  |  |  | 1,840 |
Mortgage-backed securities |  |  | 1,025,342 |  |  |  | 11,398 |  |  |  | 6 |  |  |  | 1 |  |  |  | 1,025,348 |  |  |  | 11,399 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 36 |  |  |  | 27 |  |  |  | 36 |  |  |  | 27 |
Corporate debt securities |  |  | 9,950 |  |  |  | 50 |  |  |  | 43,525 |  |  |  | 1,475 |  |  |  | 53,475 |  |  |  | 1,525 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 5,833 |  |  |  | 167 |  |  |  | 5,833 |  |  |  | 167 |
Preferred stock of government sponsored entities |  |  | 2,488 |  |  |  | 228 |  |  |  | - |  |  |  | - |  |  |  | 2,488 |  |  |  | 228 |
Other equity securities |  |  | 158 |  |  |  | 342 |  |  |  | - |  |  |  | - |  |  |  | 158 |  |  |  | 342 |
Total |  | $ | 1,410,387 |  |  | $ | 14,253 |  |  | $ | 49,400 |  |  | $ | 1,670 |  |  | $ | 1,459,787 |  |  | $ | 15,923 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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