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Derivative instruments and hedging activities (Cash flow hedges) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss)      
Unrealized net (losses) gains on cash flow hedges $ (8,872) $ (5,741) $ 536
Cash flow hedging      
Derivative Instruments, Gain (Loss)      
Unrealized net (losses) gains on cash flow hedges (6,594) (3,502) 536
Amount of net gain (loss) reclassified from AOCI into income (effective portion) (5,559) (3,992) 1,202
Amount of net gain (loss) recognized in income on derivatives (ineffective portion) $ 0 $ 0 $ (92)
Cash flow hedging | Forward contracts      
Derivative Instruments, Gain (Loss)      
Classification in the statement of operations of the net gain (loss) reclassified from AOCI into income (effective portion and ineffective portion) Mortgage banking activities Mortgage banking activities Mortgage banking activities
Unrealized net (losses) gains on cash flow hedges $ (6,594) $ (3,502) $ 536
Amount of net gain (loss) reclassified from AOCI into income (effective portion) (5,559) (3,992) 1,202
Amount of net gain (loss) recognized in income on derivatives (ineffective portion) $ 0 $ 0 $ (92)