Loans and Allowance for Loan Losses - Summary of Aging of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2022		Dec. 31, 2021
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	$ 57,618		$ 41,761
Total gross loans	1,882,585		1,461,622	[1]
Accruing	0		0
Current	57,618		41,761
Financial Asset, Not Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	1,824,967		1,419,861
Current	1,824,967		1,419,861
30-59 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	35,189		23,564
Current	35,189		23,564
60-89 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	13,526		14,173
Current	13,526		14,173
91+ [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	8,903		4,024
Current	8,903		4,024
Recreation [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	51,023	[2]	30,424
Total gross loans	1,146,095		931,859	[1]
Accruing	0		0
Current	51,023	[2]	30,424
Recreation [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	1,095,072		901,435
Current	1,095,072		901,435
Recreation [Member] | 30-59 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	31,781		20,037
Current	31,781		20,037
Recreation [Member] | 60-89 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	11,877		6,569
Current	11,877		6,569
Recreation [Member] | 91+ [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	7,365		3,818
Current	7,365		3,818
Home Improvement [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	5,101	[2]	2,128
Total gross loans	628,877		438,931	[1]
Accruing	0		0
Current	5,101	[2]	2,128
Home Improvement [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	623,776		436,803
Current	623,776		436,803
Home Improvement [Member] | 30-59 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	3,266		1,517
Current	3,266		1,517
Home Improvement [Member] | 60-89 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	1,256		479
Current	1,256		479
Home Improvement [Member] | 91+ [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	579		132
Current	579		132
Commercial Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	74	[2]	1,869
Total gross loans	93,470		76,696	[1]
Accruing	0		0
Current	74	[2]	1,869
Commercial Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	93,396		74,827
Current	93,396		74,827
Commercial Loans [Member] | 30-59 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	0		1,795
Current	0		1,795
Commercial Loans [Member] | 60-89 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	0		0
Current	0		0
Commercial Loans [Member] | 91+ [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	74		74
Current	74		74
Medallion [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	1,420	[2]	7,340
Total gross loans	13,571		14,046	[1]
Accruing	0		0
Current	1,420	[2]	7,340
Medallion [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	12,151		6,706
Current	12,151		6,706
Medallion [Member] | 30-59 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	142		215
Current	142		215
Medallion [Member] | 60-89 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	393		7,125
Current	393		7,125
Medallion [Member] | 91+ [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	885		0
Current	885		0
Strategic Partnership [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	0	[2]	0
Total gross loans	572		90	[1]
Accruing	0		0
Current	0	[2]	0
Strategic Partnership [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	572		90
Current	572		90
Strategic Partnership [Member] | 30-59 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	0		0
Current	0		0
Strategic Partnership [Member] | 60-89 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	0		0
Current	0		0
Strategic Partnership [Member] | 91+ [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Past Due	0		0
Current	$ 0		$ 0

[1] Excludes loan premiums of $0.5 million and $26.8 million of capitalized loan origination costs.

[2] Excludes $34.9 million of capitalized loan origination costs.