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SUBORDINATED DEBT ISSUANCE - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2016
Sep. 30, 2016
Debt Instrument [Line Items]              
Subordinated notes, net of issuance costs     $ 58,916,000   $ 58,872,000    
Notes, aggregate principal amount $ 20,000,000 $ 40,000,000          
Notes, interest rate 7.00% 6.875%          
Amortization of debt issuance costs     44,000 $ 45,000      
Subordinated Debt              
Debt Instrument [Line Items]              
Notes, aggregate principal amount     60,000,000        
Subordinated Debt | March 2016 Subordinated Notes              
Debt Instrument [Line Items]              
Notes, aggregate principal amount             $ 40,000,000
Notes, interest rate             6.875%
Notes, issuance cost     $ 1,382,000        
Term of notes   5 years 10 years        
Subordinated Debt | June 2016 Subordinated Notes              
Debt Instrument [Line Items]              
Notes, aggregate principal amount           $ 20,000,000  
Notes, interest rate           7.00%  
Notes, issuance cost     $ 404,000        
Term of notes 5 years   10 years