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Derivative instruments and hedging activities (Cash flow hedges) (Detail) - Cash flow hedging - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in OCI on derivatives (effective portion) $ 1,636 $ 456 $ (6,594)
Amount of net gain (loss) reclassified from AOCI into income (effective portion) 1,458 (704) (5,559)
Amount of net gain (loss) recognized in income on derivatives (ineffective portion) 0 0 0
Forward contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in OCI on derivatives (effective portion) $ 1,636 $ 456 $ (6,594)
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
Amount of net gain (loss) reclassified from AOCI into income (effective portion) $ 1,458 $ (704) $ (5,559)
Amount of net gain (loss) recognized in income on derivatives (ineffective portion) $ 0 $ 0 $ 0