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Note 7 - Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
(In thousands) |  | 2017 |  | 2016
Goodwill |  | $ | 842,651 |  |  | $ | 348,505 |
Core deposit premiums: |  |  |  |  |  |  |  |
Gross carrying amount |  |  | 105,984 |  |  |  | 48,692 |
Accumulated amortization |  |  | (16,659 | ) |  |  | (10,625 | )
Core deposit premiums, net |  |  | 89,325 |  |  |  | 38,067 |
Books of business intangible: |  |  |  |  |  |  |  |
Gross carrying amount |  |  | 15,414 |  |  |  | 15,884 |
Accumulated amortization |  |  | (2,827 | ) |  |  | (1,716 | )
Books of business intangible, net |  |  | 12,587 |  |  |  | 14,168 |
Other intangibles: |  |  |  |  |  |  |  |
Gross carrying amount |  |  | 6,037 |  |  |  | 2,068 |
Accumulated amortization |  |  | (1,878 | ) |  |  | (1,344 | )
Other intangibles, net |  |  | 4,159 |  |  |  | 724 |
Other intangible assets, net |  |  | 106,071 |  |  |  | 52,959 |
Total goodwill and other intangible assets |  | $ | 948,722 |  |  | $ | 401,464 |
Core Deposit Premium [Member] |
Notes Tables |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Year |  | (In thousands)
2018 |  | $ | 11,355 |
2019 |  |  | 11,045 |
2020 |  |  | 11,032 |
2021 |  |  | 10,970 |
2022 |  |  | 10,918 |
Thereafter |  |  | 50,751 |
Total |  | $ | 106,071 |

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