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Business Combinations - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 01, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition, Contingent Consideration [Line Items]          
Business combination transaction value $ 19,668        
common stock issued In business combination | shares 666,101        
Cash transferred $ 6,110        
Intangible asset acquired 10,719        
Goodwill resulting from merger 9,953        
Core deposit intangible 10,719        
Expenses related to the merger     $ 7,430 $ 7,404 $ 8,070
Core Deposits [Member]          
Business Acquisition, Contingent Consideration [Line Items]          
Core deposit intangible $ 766        
Intangible asset useful life 7 years        
Mississippi Gulf Coast [Member]          
Business Acquisition, Contingent Consideration [Line Items]          
No of operating banking locations 4        
Charter Bank [Member]          
Business Acquisition, Contingent Consideration [Line Items]          
Business combination transaction value $ 19,668        
common stock issued In business combination | shares 666,101        
Cash transferred $ 6,110        
percentage of voting interest acquired 100.00%        
Net interest income of acquiree   $ 1,021      
Expenses related to the merger     $ 558    
Non-interest income   720      
Income before income taxes   $ 1,362