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Note Derivative instruments and hedging activities (Derivative instruments and hedging activities- Additional Information) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instrument Detail [Abstract]      
Derivatives, Offsetting Fair Value Amounts, Policy

Pursuant to the Corporation’s accounting policy, the fair value of derivatives is not offset with the amounts for the right to reclaim cash collateral or the obligation to return cash collateral.

   
Derivative, Net Liability Position, Aggregate Fair Value $ 800 $ 4,000  
Collateral Already Posted, Aggregate Fair Value $ 4,000 10,000  
Maximum Length of Time Hedged in Cash Flow Hedge 80 days    
Fair Value Hedges At Fair Value Net $ 0 0  
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net (124) (305) $ (8,491)
Derivative Credit Risk Valuation Adjustment, Derivative Assets 900 800 100
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities 400 300 $ 1,200
Derivative, Collateral, Right to Reclaim Cash 4,000 10,000  
Derivative, Collateral, Obligation to Return Cash $ 0 $ 0