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Note 6 - Investment Securities | 3 Months Ended
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Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | 6. Investment Securities Investment securities were $1.49 billion as of March 31, 2016, compared to $1.59 billion as of December 31, 2015. The following tables reflect the amortized cost, gross unrealized gains, gross unrealized losses, and fair value of investment securities as of March 31, 2016, and December 31, 2015:
|  | 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 |
The amortized cost and fair value of investment securities as of March 31, 2016, by contractual maturities, are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or repay obligations with or without call or repayment penalties.
|  | 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 |
(1) Equity securities are reported in this category There were no sales transactions of mortgage-backed securities during the first quarter of 2016. Proceeds of $406.9 million were received from the sale of mortgage-backed securities during the three months ended March 31, 2015. Proceeds from repayments, maturities and calls of mortgage-backed securities were $33.5 million and $12.1 million for the three months ended March 31, 2016 and 2015, respectively. There were no sales transactions of other investment securities during the three months ended March 31, 2016. Proceeds of $335.1 million were received from the sale of other investment securities during the three months ended March 31, 2015. Proceeds from maturities and calls of other investment securities were $110.0 million during the three months ended March 31, 2016 compared to zero during the same period a year ago. No gains and losses were realized on sales of investment securities but a permanent impairment write-down of $206,000 was recorded during the three months ended March 31, 2016 compared to gains of $1.7 million and losses of $1.7 million realized during the same period a year ago. The tables below show the fair value and unrealized losses of the temporarily impaired securities in our investment securities portfolio as of March 31, 2016, and December 31, 2015:
|  | 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 |
As of March 31, 2016, the Company had unrealized losses of $2.9 million. The unrealized losses on these securities were primarily attributed to yield curve movement, together with the widened liquidity spread and credit spread. The issuers have not, to the Company’s knowledge, established any cause for default on these securities. Management believes the impairment was temporary and, accordingly, no impairment loss on these securities has been recognized in our condensed consolidated statements of operations. The Company expects to recover the amortized cost basis of its debt securities, and has no intent to sell and will not be required to sell available-for-sale debt securities that have declined below their cost before their anticipated recovery. Investment securities having a carrying value of $445.6 million as of March 31, 2016, and $449.6 million as of December 31, 2015, were pledged to secure public deposits, other borrowings, treasury tax and loan, and securities sold under agreements to repurchase.

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