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Note 8 - Deposits (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Summary of Deposits [Table Text Block] |
|  | As of December 31, |
|  | 2016 |  |  | 2015 |
|  | (In thousands) |
Demand |  | $ | 2,478,107 |  |  | $ | 2,033,048 |
NOW accounts |  |  | 1,230,445 |  |  |  | 966,404 |
Money market accounts |  |  | 2,198,938 |  |  |  | 1,905,719 |
Saving accounts |  |  | 719,949 |  |  |  | 618,164 |
Time deposits |  |  | 5,047,287 |  |  |  | 4,985,752 |
Total |  | $ | 11,674,726 |  |  | $ | 10,509,087 |
Schedule of Maturities for Time Deposits [Table Text Block] |
|  | Expected Maturity Date at December 31, |  |  |  |  |
|  | 2017 |  |  | 2018 |  |  | 2019 |  |  | 2020 |  |  | 2021 |  |  | Thereafter |  |  | Total |
|  | (In thousands) |
Time deposits |  | $ | 4,597,359 |  |  | $ | 371,713 |  |  | $ | 75,266 |  |  | $ | 2,899 |  |  | $ | 39 |  |  | $ | 11 |  |  | $ | 5,047,287 |
Summary of Interest Expense on Deposits [Table Text Block] |
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (In thousands) |
Interest bearing demand |  | $ | 1,740 |  |  | $ | 1,406 |  |  | $ | 1,229 |
Money market accounts |  |  | 13,308 |  |  |  | 10,138 |  |  |  | 8,627 |
Saving accounts |  |  | 1,046 |  |  |  | 901 |  |  |  | 802 |
Time deposits |  |  | 43,327 |  |  |  | 39,443 |  |  |  | 35,111 |
Total |  | $ | 59,421 |  |  | $ | 51,888 |  |  | $ | 45,769 |

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