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Allowance for Loans Losses - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]        
Purchase loans   $ 14,910,000 $ 19,686,000  
Bad debts recovered   133,000 211,000  
Outstanding specifically impaired loans   1,013,259,000 642,262,000  
Specific impairment   1,364,000 1,408,000  
Gross loans   1,031,838,000 647,572,000  
Doubtful [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Gross loans   0 0  
Loss [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Gross loans   0 $ 0  
Specifically impaired loans [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Bad debts recovered $ 200,000     $ 200,000
Specifically impaired loans [Member] | PCI loans [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Outstanding specifically impaired loans   2,191,000    
Specific impairment   $ 190,000