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Fair Value of Assets and Liabilities - Summary of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets      
Impaired loans $ 107,131,000 $ 113,581,000  
Loan collateral in process of foreclosure 54,560,000 [1] 52,711,000 [1] $ 49,495,000
Fair Value, Nonrecurring      
Assets      
Equity investments 9,746,000 10,079,000  
Impaired loans 62,174,000 34,915,000  
Loan collateral in process of foreclosure 54,560,000 52,711,000  
Total 126,480,000 97,705,000  
Fair Value, Nonrecurring | Level 3 [Member]      
Assets      
Equity investments 9,746,000 10,079,000  
Impaired loans 62,174,000 34,915,000  
Loan collateral in process of foreclosure 54,560,000 52,711,000  
Total $ 126,480,000 $ 97,705,000  
[1] Includes financed sales of this collateral to third parties that are reported separately from the loan portfolio, and that are conducted by Medallion Bank of $3,535 and $8,163 as of December 31, 2020 and 2019.