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Significant Accounting Policies - Impact of the CECL Accounting Adoption (Detail) - USD ($)
$ in Thousands
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses $ 122,300 $ 62,200       $ 58,300 $ 48,910 $ 41,250
Automobile loans [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 1,419 820       $ 1,893 $ 4,025 $ 5,910
Small loan [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 54,773              
Large loan [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 62,698              
Retail loan [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 3,410              
Pre-adoption Allowance [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 62,200 $ (62,200) $ (60,900) $ (57,200) $ (56,400)      
Pre-adoption Allowance [Member] | Automobile loans [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 820              
Pre-adoption Allowance [Member] | Small loan [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 30,588              
Pre-adoption Allowance [Member] | Large loan [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 29,148              
Pre-adoption Allowance [Member] | Retail loan [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 1,644              
CECL Adoption Adjustment [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 60,100              
CECL Adoption Adjustment [Member] | Automobile loans [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 599              
CECL Adoption Adjustment [Member] | Small loan [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 24,185              
CECL Adoption Adjustment [Member] | Large loan [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses 33,550              
CECL Adoption Adjustment [Member] | Retail loan [Member]                
Loans and leases receivable disclosure [Line Items]                
Allowance for credit losses $ 1,766