Loans and Allowance for Loan Losses - Summary of Aging of Loans (Detail) - USD ($) $ in Thousands		Jun. 30, 2020		Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		$ 54,785		$ 60,413
Current		1,179,902		1,076,281
Total		1,234,687	[1]	1,136,694	[2]
Accruing		45		0
30-59 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		29,344		40,779
60-89 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		9,865		10,971
91+ [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		15,576		8,663
Recreation [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		20,342		41,583
Current		741,061		648,227
Total		761,403	[1]	689,810	[2]
Accruing		45		0
Recreation [Member] | 30-59 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		12,749		27,357
Recreation [Member] | 60-89 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		4,228		8,426
Recreation [Member] | 91+ [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		3,365		5,800
Home Improvement [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		823		1,542
Current		284,632		249,288
Total		285,455	[1]	250,830	[2]
Accruing		0		0
Home Improvement [Member] | 30-59 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		461		931
Home Improvement [Member] | 60-89 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		225		427
Home Improvement [Member] | 91+ [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		137		184
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		113		107
Current		71,363		69,660
Total		71,476	[1]	69,767	[2]
Accruing		0		0
Commercial Loans [Member] | 30-59 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		0
Commercial Loans [Member] | 60-89 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		6
Commercial Loans [Member] | 91+ [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		107		107
Medallion [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		33,507	[3]	17,181
Current		82,838	[3]	109,106
Total		116,345	[1],[3]	126,287	[2]
Accruing		0	[3]	0
Medallion [Member] | 30-59 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		16,134	[3]	12,491
Medallion [Member] | 60-89 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		5,406	[3]	2,118
Medallion [Member] | 91+ [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		11,967	[3]	$ 2,572
Strategic Partnership [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		0
Current		8
Total	[1]	8
Accruing		0
Strategic Partnership [Member] | 30-59 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		0
Strategic Partnership [Member] | 60-89 [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		0
Strategic Partnership [Member] | 91+ [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		$ 0

[1] Excludes loan premiums of $5,251 resulting from purchase price accounting and $20,656 of capitalized loan origination costs.

[2] Excludes loan premiums of $5,758 resulting from purchase price accounting and $18,403 of capitalized loan origination costs.

[3] Included in the current medallion loan aging bucket were $80,403 of loans that had been granted deferral status under the CARES Act, some or all of which may have become delinquent had they not been granted the deferral status.