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Note 9 - Deposits (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure Text Block [Abstract] |
Summary of Deposits [Table Text Block] |
|  | As of December 31, |
|  | 2015 |  |  | 2014 |
|  | (In thousands) |
Demand |  | $ | 2,033,048 |  |  | $ | 1,664,914 |
NOW accounts |  |  | 966,404 |  |  |  | 778,691 |
Money market accounts |  |  | 1,905,719 |  |  |  | 1,538,187 |
Saving accounts |  |  | 618,164 |  |  |  | 533,940 |
Time deposits |  |  | 4,985,752 |  |  |  | 4,267,728 |
Total |  | $ | 10,509,087 |  |  | $ | 8,783,460 |
Schedule of Maturities for Time Deposits [Table Text Block] |
|  | Expected Maturity Date at December 31, |  |  |  |  |
|  | 2016 |  |  | 2017 |  |  | 2018 |  |  | 2019 |  |  | 2020 |  |  | Thereafter |  |  | Total |
|  | (In thousands) |
Time deposits |  | $ | 3,695,164 |  |  | $ | 997,735 |  |  | $ | 249,147 |  |  | $ | 42,788 |  |  | $ | 907 |  |  | $ | 11 |  |  | $ | 4,985,752 |
Summary of Interest Expense on Deposits [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (In thousands) |
Interest bearing demand |  | $ | 1,406 |  |  | $ | 1,229 |  |  | $ | 1,017 |
Money market accounts |  |  | 10,138 |  |  |  | 8,627 |  |  |  | 7,034 |
Saving accounts |  |  | 901 |  |  |  | 802 |  |  |  | 374 |
Time deposits |  |  | 39,443 |  |  |  | 35,111 |  |  |  | 31,964 |
Total |  | $ | 51,888 |  |  | $ | 45,769 |  |  | $ | 40,389 |

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