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Goodwill and Intangible Assets - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
reporting_unit
Dec. 31, 2019
USD ($)
Jan. 04, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill   $ 156,277 $ 156,277 $ 19,800
Number of reporting units | reporting_unit   1    
Core Deposits        
Acquired Finite-Lived Intangible Assets [Line Items]        
Intangible assets   $ 4,000 $ 4,300  
Finite-lived intangible assets acquired $ 3,700