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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