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Note Goodwill and other intangible assets (Components of other intangible assets subject to amortization) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 73,344 $ 72,907
Finite Lived Intangible Assets Accumulated Amortization 50,338 43,398
Finite-Lived Intangible Assets, Net 23,006 29,509
Core deposits    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Core Deposits, Gross 37,224 37,224
Finite Lived Intangible Assets Accumulated Amortization 25,139 22,347
Finite-Lived Intangible Assets, Net 12,085 14,877
Other customer relationship    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Customer Relationships, Gross 35,632 35,683
Finite Lived Intangible Assets Accumulated Amortization 25,182 21,051
Finite-Lived Intangible Assets, Net 10,450 $ 14,632
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 488  
Finite Lived Intangible Assets Accumulated Amortization 17  
Finite-Lived Intangible Assets, Net $ 471