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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill $ 443,001 $ 420,562
Core deposit premiums 1,112 1,753
Customer relationship and other intangibles 21,466 14,142
Mortgage servicing rights 633 562
Total intangible assets $ 466,212 $ 437,019