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Employee Stock Ownership Plan - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 12, 1998
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 01, 2018
Apr. 30, 2018
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]            
Purchase of common stock shares   2,013,137        
Fixed interest rate         3.25% 8.25%
Contributions to ESOP   $ 1,400 $ 505      
Dividends paid unallocated ESOP shares   287 195      
Outstanding loan   $ 10,400 $ 3,100      
Unallocated shares of ESOP   525,241 293,860      
Fair value of unallocated shares   $ 11,800        
Shares allocated to participants   2,353,027        
Shares committed to be released   59,105        
Minimum            
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]            
Extended loan term 12 years          
Maximum            
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]            
Extended loan term 30 years          
Employee Stock Ownership Plan            
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]            
Minimum age limit for employees to participate in ESOP   21 years        
Minimum number of working hours   1000 hours        
ESOP original borrowings   $ 13,400        
Additional borrowings $ 8,200       $ 8,400  
Additional common stock shares 633,750       292,592  
Compensation expense related to ESOP   1,618 $ 919 $ 657    
Increase in the average fair value   $ 596 $ 637 $ 373