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Note 7 - Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2017
Notes Tables |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
(In thousands) |  | September 30, 2017 |  | December 31, 2016
Goodwill |  | $ | 375,731 |  |  | $ | 348,505 |
Core deposit premiums: |  |  |  |  |  |  |  |
Gross carrying amount |  |  | 56,532 |  |  |  | 48,692 |
Accumulated amortization |  |  | (14,297 | ) |  |  | (10,625 | )
Core deposit premiums, net |  |  | 42,235 |  |  |  | 38,067 |
Purchased credit card relationships: |  |  |  |  |  |  |  |
Gross carrying amount |  |  | 2,068 |  |  |  | 2,068 |
Accumulated amortization |  |  | (1,654 | ) |  |  | (1,344 | )
Purchased credit card relationships, net |  |  | 414 |  |  |  | 724 |
Books of business intangible: |  |  |  |  |  |  |  |
Gross carrying amount |  |  | 15,414 |  |  |  | 15,884 |
Accumulated amortization |  |  | (2,562 | ) |  |  | (1,716 | )
Books of business intangible, net |  |  | 12,852 |  |  |  | 14,168 |
Other intangible assets, net |  |  | 55,501 |  |  |  | 52,959 |
Total goodwill and other intangible assets |  | $ | 431,232 |  |  | $ | 401,464 |
Core Deposit Premium [Member] |
Notes Tables |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Year |  | (In thousands)
Remainder of 2017 |  | $ | 1,665 |
2018 |  |  | 6,557 |
2019 |  |  | 6,247 |
2020 |  |  | 6,234 |
2021 |  |  | 6,172 |
Thereafter |  |  | 28,626 |
Total |  | $ | 55,501 |

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