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Allowance for Loans Losses - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]        
Purchase loans $ 16,158,000   $ 19,686,000  
Bad debts recovered 69,000   211,000  
Outstanding specifically impaired loans 666,038,000   642,262,000  
Specific impairment 1,077,000   1,408,000  
Gross loans 671,666,000   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 2,223,000      
Specific impairment $ 190,000