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Note 6 - Investment Securities | 6 Months Ended
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Jun. 30, 2015
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 $1.55 billion at June 30, 2015, compared to $1.32 billion at December 31, 2014. The following tables reflect the amortized cost, gross unrealized gains, gross unrealized losses, and fair value of investment securities as of June 30, 2015, and December 31, 2014:
|  | June 30, 2015 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 299,911 |  |  | $ | 199 |  |  | $ | - |  |  | $ | 300,110 |
U.S. government sponsored entities |  |  | 49,975 |  |  |  | 152 |  |  |  | - |  |  |  | 50,127 |
Mortgage-backed securities |  |  | 1,110,298 |  |  |  | 759 |  |  |  | 9,654 |  |  |  | 1,101,403 |
Collateralized mortgage obligations |  |  | 70 |  |  |  | - |  |  |  | 30 |  |  |  | 40 |
Corporate debt securities |  |  | 74,949 |  |  |  | 528 |  |  |  | 1,078 |  |  |  | 74,399 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 156 |  |  |  | 5,844 |
Preferred stock of government sponsored entities |  |  | 2,811 |  |  |  | 733 |  |  |  | - |  |  |  | 3,544 |
Other equity securities |  |  | 3,628 |  |  |  | 6,606 |  |  |  | 2 |  |  |  | 10,232 |
Total |  | $ | 1,547,642 |  |  | $ | 8,977 |  |  | $ | 10,920 |  |  | $ | 1,545,699 |
|  | December 31, 2014 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 664,206 |  |  | $ | 63 |  |  | $ | 265 |  |  | $ | 664,004 |
Mortgage-backed securities |  |  | 549,296 |  |  |  | 1,393 |  |  |  | 6,386 |  |  |  | 544,303 |
Collateralized mortgage obligations |  |  | 79 |  |  |  | - |  |  |  | 34 |  |  |  | 45 |
Corporate debt securities |  |  | 94,943 |  |  |  | 776 |  |  |  | 1,247 |  |  |  | 94,472 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 134 |  |  |  | 5,866 |
Preferred stock of government sponsored entities |  |  | 6,276 |  |  |  | 681 |  |  |  | 3,733 |  |  |  | 3,224 |
Other equity securities |  |  | 3,608 |  |  |  | 3,413 |  |  |  | - |  |  |  | 7,021 |
Total |  | $ | 1,324,408 |  |  | $ | 6,326 |  |  | $ | 11,799 |  |  | $ | 1,318,935 |
The amortized cost and fair value of investment securities at June 30, 2015, 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 |  | $ | 299,913 |  |  | $ | 300,112 |
Due after one year through five years |  |  | 88,156 |  |  |  | 89,227 |
Due after five years through ten years |  |  | 45,607 |  |  |  | 44,609 |
Due after ten years (1) |  |  | 1,113,966 |  |  |  | 1,111,751 |
Total |  | $ | 1,547,642 |  |  | $ | 1,545,699 |
(1) Equity securities are reported in this category |
Proceeds from sales of mortgage-backed securities were $573.5 million during the first six months of 2015 compared to $386.5 million during the same period a year ago. Proceeds from repayments, maturities and calls of mortgage-backed securities were $36.5 million during the first six months of 2015 compared to $39.6 million during the same period a year ago. Proceeds from sales of other investment securities were $385.2 million during the first six months of 2015 compared to $80.4 million during the same period a year ago. Proceeds from maturities and calls of other investment securities were zero during the first six months of 2015 compared to $135.8 million during the same period a year ago. Gains of $2.3 million and losses of $1.8 million were realized on sales of investment securities during the first six months of 2015 compared to gains of $12.8 million and losses of $6.3 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 June 30, 2015, and December 31, 2014:
|  | June 30, 2015 |
|  | 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 |  | $ | 1,087,436 |  |  | $ | 9,653 |  |  | $ | 6 |  |  | $ | 1 |  |  | $ | 1,087,442 |  |  | $ | 9,654 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 40 |  |  |  | 30 |  |  |  | 40 |  |  |  | 30 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | 43,922 |  |  |  | 1,078 |  |  |  | 43,922 |  |  |  | 1,078 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 5,844 |  |  |  | 156 |  |  |  | 5,844 |  |  |  | 156 |
Other equity securities |  |  | 18 |  |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | 18 |  |  |  | 2 |
Total |  | $ | 1,087,454 |  |  | $ | 9,655 |  |  | $ | 49,812 |  |  | $ | 1,265 |  |  | $ | 1,137,266 |  |  | $ | 10,920 |
|  | December 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 374,153 |  |  | $ | 265 |  |  | $ | - |  |  | $ | - |  |  | $ | 374,153 |  |  | $ | 265 |
Mortgage-backed securities |  |  | - |  |  |  | - |  |  |  | 425,090 |  |  |  | 6,386 |  |  |  | 425,090 |  |  |  | 6,386 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 45 |  |  |  | 34 |  |  |  | 45 |  |  |  | 34 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | 63,753 |  |  |  | 1,247 |  |  |  | 63,753 |  |  |  | 1,247 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 5,866 |  |  |  | 134 |  |  |  | 5,866 |  |  |  | 134 |
Preferred stock of government sponsored entities |  |  | 2,448 |  |  |  | 3,733 |  |  |  | - |  |  |  | - |  |  |  | 2,448 |  |  |  | 3,733 |
Total |  | $ | 376,601 |  |  | $ | 3,998 |  |  | $ | 494,754 |  |  | $ | 7,801 |  |  | $ | 871,355 |  |  | $ | 11,799 |
Total unrealized losses of $10.9 million at June 30, 2015, were primarily caused by increases in interest rates subsequent to the date that these securities were purchased or caused by the widening of credit and liquidity spreads since the dates of acquisition. The contractual terms of those investments do not permit the issuers to settle the security at a price less than the amortized cost of the investment. At June 30, 2015, management believed the impairment was temporary and, accordingly, no impairment loss on debt 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 $519.2 million at June 30, 2015, and $591.3 million at December 31, 2014, were pledged to secure public deposits, other borrowings, treasury tax and loan, and securities sold under agreements to repurchase.

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