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Note 6 - Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
(In thousands) |  | 2016 |  | 2015
Goodwill |  | $ | 348,505 |  |  | $ | 327,686 |
Core deposit premiums: |  |  |  |  |  |  |  |
Gross carrying amount |  |  | 48,692 |  |  |  | 43,648 |
Accumulated amortization |  |  | (10,625 | ) |  |  | (6,217 | )
Core deposit premiums, net |  |  | 38,067 |  |  |  | 37,431 |
Purchased credit card relationships: |  |  |  |  |  |  |  |
Gross carrying amount |  |  | 2,068 |  |  |  | 2,068 |
Accumulated amortization |  |  | (1,344 | ) |  |  | (931 | )
Purchased credit card relationships, net |  |  | 724 |  |  |  | 1,137 |
Books of business intangible: |  |  |  |  |  |  |  |
Gross carrying amount |  |  | 15,884 |  |  |  | 15,293 |
Accumulated amortization |  |  | (1,716 | ) |  |  | (624 | )
Books of business intangible, net |  |  | 14,168 |  |  |  | 14,669 |
Other intangible assets, net |  |  | 52,959 |  |  |  | 53,237 |
Total goodwill and other intangible assets |  | $ | 401,464 |  |  | $ | 380,923 |
Core Deposit Premium [Member] |
Notes Tables |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
(In thousands) | Year |  | Amortization Expense
| 2017 |  | $ | 6,202 |
| 2018 |  |  | 6,099 |
| 2019 |  |  | 5,789 |
| 2020 |  |  | 5,777 |
| 2021 |  |  | 5,715 |
| Thereafter |  |  | 23,377 |
| Total |  | $ | 52,959 |

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