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Note Derivative instruments and hedging activities (Non-hedging activities) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives $ 1,273 $ (923) $ (124)
Forward contracts | Mortgage Banking Activities      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives 1,213 (1,484) (160)
Interest rate swap | Other operating income      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives 0 51 333
Foreign currency forward contracts | Other operating income      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives 0 67 27
Foreign currency forward contracts | Interest Expense      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives 0 (14) 12
Interest rate cap | Other operating income      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives (4) (48) 57
Indexed options on deposits | Interest Expense      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives 114 5,934 1,981
Bifurcated embedded options | Interest Expense      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives $ (50) $ (5,429) $ (2,374)