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Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Investments in Affordable Housing and Alternative Energy Partnerships [Table Text Block] |
|  | As of December 31, |
(In thousands ) |  | 201 7 |  |  | 201 6 |
Investments in affordable housing partnerships, net |  | $ | 260,112 |  |  | $ | 236,787 |
Other borrowings for affordable housing limited partnerships |  | $ | 17,481 |  |  | $ | 17,661 |
Investments in affordable housing pertnerships, unfunded commitments |  | $ | 124,657 |  |  | $ | 115,038 |
Investments in alternative energy tax credit partnerships, net |  | $ | 12,759 |  |  | $ | 14,290 |
Unfunded Commitments Future Estimated Payments [Table Text Block] |
|  | Amoun t |
Year Ending December 31 , |  | (In thousands ) |
2018 |  | $ | 54,817 |
2019 |  |  | 37,921 |
2020 |  |  | 16,528 |
2021 |  |  | 11,238 |
2022 |  |  | 728 |
Thereafter |  |  | 3,425 |
Total unfunded commitments |  | $ | 124,657 |
Usage of Affordable Housing and Other Tax Credits Including Energy Tax Credit [Table Text Block] |
|  | As of December 31, |
(In thousands ) |  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Affordable housing and other tax credits recognized |  | $ | 17,727 |  |  | $ | 13,422 |  |  | $ | 10,100 |
Alternative energy tax credit usage |  | $ | 3,301 |  |  | $ | 24,472 |  |  | $ | 21,000 |

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