Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)		3 Months Ended			6 Months Ended		12 Months Ended
	Jan. 01, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest-bearing funds deposited in other banks		$ 1,300,000			$ 1,300,000
Non-marketable securities		11,400,000			11,400,000		$ 10,300,000
Impact of equity investment		2,500,000			2,500,000
Past Due		48,254,000			48,254,000		57,618,000
Notes receivable net		79,500			79,500
Net loan origination costs					40,400,000		34,900,000
Net amortization to income		(2,400,000)		$ (2,400,000)	(4,300,000)	$ (4,500,000)
Amount of loan charged off					2,500,000
Principal portion of loans serviced, fair value		15,600,000			15,600,000		19,500,000
Loans write down to collateral value		12,862,000		6,182,000	$ 30,959,000	13,968,000
Intangible assets useful life					20 years
Goodwill		150,803,000			$ 150,803,000		150,803,000
Intangible assets, net		21,315,000			21,315,000		22,035,000
Amortization of intangible assets		363,000		363,000	723,000	721,000
Depreciation and amortization		100,000		100,000	100,000	100,000
Amortization expense		800,000		700,000	1,500,000	$ 1,300,000
Deferred costs		6,800,000			$ 6,800,000		$ 7,000,000.0
Potential dilutive common shares excluded from EPS computation					644,478	832,895
Stock based compensation award					296,444	0
Stock based compensation award, Amount		$ 1,200,000		$ 900,000	$ 2,200,000	$ 1,500,000
Stock based compensation award per diluted common share		$ 0.05		$ 0.04	$ 0.10	$ 0.06
Unrecognized compensation cost related to unvested stock options and restricted stock		$ 5,900,000			$ 5,900,000
Unrecognized compensation cost related to unvested stock options and restricted stock, recognition period					11 months
Tier 1 leverage capital to total assets ratio		15.00%			15.00%
Tier 1 leverage capital ratio		16.00%			16.00%
Capital conversation buffer					2.50%		2.50%
Consumer Loan [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for credit losses on loans	$ 13,700,000
Commercial Loans [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing receivable allowance for credit loss	$ 9,900,000
Restricted Shares [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock based compensation award		11,734	304,749		316,483	383,925	522,475
Restricted Stock Units [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock based compensation award					0	0
Medallion Bank [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of intangible assets							$ 0
90+ [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Past Due		$ 6,190,000			$ 6,190,000		8,903,000
90+ [Member] | Loans [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Past Due		$ 6,200,000			$ 6,200,000		$ 8,900,000
Total loans more than 90 days past due ,percentage		0.29%			0.29%		0.47%
Bank Holding Company Accounting [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net premium on investment securities					$ 100,000		$ 100,000
Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity securities, fair value		$ 1,700,000			1,700,000		$ 1,700,000
Equity Securities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Purchased of equity securities with readily determinable fair value					$ 2,000,000.0
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest bearing loan term					5 years
Estimated useful life of fixed assets					3 years
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest bearing loan term					6 years
Investment securities Amortized to interest income		$ 100,000				$ 100,000
Estimated useful life of fixed assets					10 years