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Fair Value of Assets and Liabilities - Summary of Valuation Techniques and Significant Unobservable Inputs Used in Non-Recurring Level 3 Fair Value Measurements of Assets and Liabilities (Detail) | 12 Months Ended |
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Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Principal portion of loans serviced, fair value | $ 107,131,000 |  | $ 113,581,000 |  |
Loan collateral in process of foreclosure | $ 54,560,000 | [1] | $ 52,711,000 | [1] | $ 49,495,000
Equity Investments [Member] | Precedent Market Transactions [Member] | Equity Method Offering Price [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Equity Value | $ / shares | $ 8.73 |  | $ 8.73 |  |
Equity Investments [Member] | Precedent Arms Length Offer [Member] | Financial Condition and Operating Performance Enterprise Value [Member] | Minimum [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Equity Value |  |  | $ 4,855,000 |  |
Equity Value |  |  | 1.59 |  |
Equity Investments [Member] | Precedent Arms Length Offer [Member] | Financial Condition and Operating Performance Enterprise Value [Member] | Maximum [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Equity Value |  |  | $ 6,120,000 |  |
Equity Investments [Member] | Precedent Arms Length Offer [Member] | Discount Rate [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Equity Value |  |  | 0.25 |  |
Impaired Loans [Member] | Market Approach [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Impaired loans, balance percentage | 0.60 |  |  |  |
Impaired Loans [Member] | Market Approach [Member] | Historical and Actual Loss Experience [Member] | Minimum [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Impaired loans value | 0.0150 |  |  |  |
Impaired Loans [Member] | Market Approach [Member] | Historical and Actual Loss Experience [Member] | Maximum [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Impaired loans value | 0.0600 |  |  |  |
Impaired Loans [Member] | Market Approach [Member] | Measurement Input Median Transfer Price [Member] | Minimum [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Principal portion of loans serviced, fair value | $ 600 |  |  |  |
Impaired Loans [Member] | Market Approach [Member] | Measurement Input Median Transfer Price [Member] | Maximum [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Principal portion of loans serviced, fair value | 108,700 |  |  |  |
Loan Collateral in Process of Foreclosure [Member] | Market Approach [Member] | Collateral Value [Member] | Minimum [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Loan collateral in process of foreclosure value | 700 |  |  |  |
Loan Collateral in Process of Foreclosure [Member] | Market Approach [Member] | Collateral Value [Member] | Maximum [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Loan collateral in process of foreclosure value | 32,300 |  |  |  |
Loan Collateral in Process of Foreclosure [Member] | Market Approach [Member] | Measurement Input Median Transfer Price [Member] | Minimum [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Loan collateral in process of foreclosure value | 600 |  |  |  |
Loan Collateral in Process of Foreclosure [Member] | Market Approach [Member] | Measurement Input Median Transfer Price [Member] | Maximum [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Loan collateral in process of foreclosure value | 108,700 |  |  |  |
Level 3 [Member] | Equity Investments [Member] | Investee Financial Analysis [Member] | Measurement Input Financial Condition and Operational Performance [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Equity investments | 8,291,000 |  | $ 7,435,000 |  |
Level 3 [Member] | Equity Investments [Member] | Precedent Market Transactions [Member] | Equity Method Offering Price [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Equity investments | 1,455,000 |  | 1,455,000 |  |
Level 3 [Member] | Equity Investments [Member] | Investee Book Value Adjusted for Market Appreciation [Member] | Financial Condition and Operating Performance of the Investee [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Equity investments |  |  | $ 1,189,000 |  |
Level 3 [Member] | Impaired Loans [Member] | Market Approach [Member] | Historical and Actual Loss Experience [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Principal portion of loans serviced, fair value | 62,174,000 |  |  |  |
Level 3 [Member] | Loan Collateral in Process of Foreclosure [Member] | Market Approach [Member] | Collateral Value [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Loan collateral in process of foreclosure | 1,432,000 |  |  |  |
Level 3 [Member] | Loan Collateral in Process of Foreclosure [Member] | Market Approach [Member] | Measurement Input Median Transfer Price [Member] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Loan collateral in process of foreclosure | $ 53,128,000 |  |  |  |
[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.

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