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Subordinated Notes - Additional Information (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2016
Mar. 31, 2016
Debt Instrument [Line Items]        
Subordinated notes, net $ 58,872,000 $ 58,693,000    
Subordinated Debt        
Debt Instrument [Line Items]        
Aggregate principal amount $ 60,000,000      
Subordinated Debt | March 2016 Subordinated Notes        
Debt Instrument [Line Items]        
Aggregate principal amount       $ 40,000,000
Interest repricing margin       6.875%
Subordinated Debt | June 2016 Subordinated Notes        
Debt Instrument [Line Items]        
Aggregate principal amount     $ 20,000,000  
Interest repricing margin     7.00%