Note Goodwill and other intangible assets (Components of other intangible assets subject to amortization) (Detail) - USD ($) $ in Thousands |
Jun. 30, 2017 |
Dec. 31, 2016 |
---|---|---|
Finite-Lived Intangible Assets [Line Items] | ||
Gross Amount | $ 73,673 | $ 73,723 |
Finite Lived Intangible Assets Accumulated Amortization | 39,475 | 34,786 |
Finite-Lived Intangible Assets, Net | 34,198 | 38,937 |
Core deposits | ||
Finite-Lived Intangible Assets [Line Items] | ||
Finite-Lived Core Deposits, Gross | 37,224 | 37,274 |
Finite Lived Intangible Assets Accumulated Amortization | 20,485 | 18,624 |
Finite-Lived Intangible Assets, Net | 16,739 | 18,650 |
Other customer relationship | ||
Finite-Lived Intangible Assets [Line Items] | ||
Finite-Lived Customer Relationships, Gross | 36,449 | 36,449 |
Finite Lived Intangible Assets Accumulated Amortization | 18,990 | 16,162 |
Finite-Lived Intangible Assets, Net | $ 17,459 | $ 20,287 |