Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended				6 Months Ended			12 Months Ended
	Jun. 30, 2022		Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021	Dec. 31, 2021	Apr. 02, 2018
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	10,900,000				10,900,000			$ 9,700,000
Past Due	35,582,000	[1]			35,582,000	[1]		41,761,000
Notes receivable net	79,500				79,500
Investment securities Amortized to interest income	100,000			$ 100,000	100,000		$ 100,000
Net loan origination costs					31,600,000			26,100,000
Net amortization to income	(2,400,000)			(2,100,000)	$ (4,500,000)		(3,700,000)
Percentage of write down of loan balance					40.00%
Principal portion of loans serviced, fair value	19,700,000				$ 19,700,000			20,500,000
Loans write down to collateral value	(6,182,000)			16,249,000	$ 13,968,000		23,097,000
Intangible assets useful life					20 years
Goodwill	150,803,000				$ 150,803,000			150,803,000
Intangible assets, net	22,759,000				22,759,000			23,480,000
Amortization of intangible assets	363,000			361,000	721,000		722,000
Financing receivable, recorded investment, 90 days past due and still accruing	0				0			0
Depreciation and amortization	100,000			200,000	100,000		200,000
Amortization expense	700,000			600,000	1,300,000		$ 1,200,000
Deferred costs	7,400,000				$ 7,400,000			$ 7,100,000
Potential dilutive common shares excluded from EPS computation					832,895		396,373
Stock based compensation award					0		317,398
Stock based compensation award, Amount	$ 900,000			$ 600,000	$ 1,500,000		$ 1,100,000
Stock based compensation award per diluted common share	$ 0.04			$ 0.02	$ 0.06		$ 0.04
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	17.00%				17.00%
Capital conversation buffer					2.50%			2.50%
Restricted Shares [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock based compensation award			383,925		383,925		163,561	258,120
Restricted Stock Units [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock based compensation award					0		16,803
RPAC [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Past Due									$ 12,400,000
Financing receivable, recorded investment, 90 days past due and still accruing	$ 200,000				$ 200,000			$ 500,000
Loan portfolio premium amortized to interest income	200,000			$ 1,700,000	300,000		$ 1,900,000
Medallion Bank [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of intangible assets					0			0
New York City [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans write down to collateral value					79,500
91+ [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Past Due	4,280,000				4,280,000			4,024,000
91+ [Member] | Loans [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Past Due	$ 4,300,000				$ 4,300,000			$ 4,000,000.0
Total loans more than 90 days past due ,percentage	0.25%				0.25%			0.28%
Bank Holding Company Accounting [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net premium on investment securities					$ 100,000			$ 300,000
Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity securities, fair value	$ 1,800,000				$ 1,800,000			$ 2,000,000.0
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					4 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					7 years
Estimated useful life of fixed assets					10 years

[1] Excludes loan premiums of $0.2 million and $31.6 million of capitalized loan origination costs.