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Fair Value Disclosures - Schedule of Gain Loss on Sale of Mortgage Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Scheduleofgainlossonsaleofmortgageloans [Abstract]      
Realized gain on sale and fees on mortgage loans* $ 37,091 $ 39,378 $ 17,748
Change in fair value on loans held-for-sale and IRLCs (5,259) 5,900 145
Change in forward mortgage-backed securities trades 1,413 (1,406) 251
Total gain on sale of mortgage loans $ 33,245 $ 43,872 $ 18,144