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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 04, 2019
Dec. 31, 2018
Goodwill And Intangible Assets [Line Items]      
Goodwill $ 156,277   $ 136,433
Core Deposits      
Goodwill And Intangible Assets [Line Items]      
Core deposit intangible $ 4,600   $ 1,800
Highlands Bancorp, Inc.      
Goodwill And Intangible Assets [Line Items]      
Goodwill   $ 19,844  
Identifiable intangible assets   $ 3,728