Quarterly report pursuant to Section 13 or 15(d)

Derivative and Risk Management Activities - Summary of the Gains/(Losses) on Derivative Instruments (Detail)

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Derivative and Risk Management Activities - Summary of the Gains/(Losses) on Derivative Instruments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Interest rate lock commitments and loan purchase commitments [Member]        
Derivative [Line Items]        
Derivative activity $ 10,017 $ (3,536) $ (49,557) $ (10,660)
Forward mortgage backed securities and forward to be announced [Member]        
Derivative [Line Items]        
Derivative activity 94,350 (40,289) 113,331 210,967
Interest rate swaps and futures contracts [Member]        
Derivative [Line Items]        
Derivative activity $ 67,814 $ (37,383) $ 43,935 $ 239,543