Annual report pursuant to Section 13 and 15(d)

Employee Benefits - Additional Information (Detail)

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Employee Benefits - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items]      
Accrued expense liability for personal paid time off $ 2.5    
Bank-Owned Life Insurance      
Defined Contribution Plan Disclosure [Line Items]      
Cash surrender value $ 52.8    
Section 401(k) Plan      
Defined Contribution Plan Disclosure [Line Items]      
Percent of participant contributions (percent) 75.00%    
Percent of employer contribution (up to, percent) 8.00%    
Contributions $ 2.4 $ 2.4 $ 2.0