Fair Value of Assets and Liabilities - Summary of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Detail) - USD ($)	Dec. 31, 2019		Dec. 31, 2018		Mar. 31, 2018	[2]
Assets
Impaired loans	$ 113,581,000		$ 140,180,000
Loan collateral in process of foreclosure	52,711,000	[1]	49,495,000	[1]	$ 52,848,000
Fair Value, Measurements, Nonrecurring [Member]
Assets
Impaired loans	34,915,000		47,974,000
Loan collateral in process of foreclosure	52,711,000		49,495,000
Total	87,626,000		97,469,000
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Assets
Impaired loans	34,915,000		47,974,000
Loan collateral in process of foreclosure	52,711,000		49,495,000
Total	$ 87,626,000		$ 97,469,000

[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 $8,163 and $3,134 as of December 31, 2019 and 2018.

[2] Beginning balance for the nine months ended December 31, 2018 reflects the transition to Bank Holding Company Accounting by reclassifying the medallions loans of the Company of $31,099,000 from investments to loans in process of foreclosure as of April 2, 2018.