Loans and Allowance for Credit Losses - Summary of Performance Status of Loan (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 2,156,998	$ 1,916,953
Percentage of Nonperforming to Total	0.75%	1.70%
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 2,140,853	$ 1,884,403
Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	16,145	32,550
Recreation [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,331,114	$ 1,183,512
Percentage of Nonperforming to Total	0.40%	0.82%
Recreation [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,325,745	$ 1,173,846
Recreation [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	5,369	9,666
Home Improvement [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 728,468	$ 626,399
Percentage of Nonperforming to Total	0.16%	0.09%
Home Improvement [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 727,332	$ 625,820
Home Improvement [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	1,136	579
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 92,637	$ 92,899
Percentage of Nonperforming to Total	6.68%	9.40%
Commercial [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 86,445	$ 84,165
Commercial [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	6,192	8,734
Medallion [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 3,448	$ 13,571
Percentage of Nonperforming to Total	100.00%	100.00%
Medallion [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 0	$ 0
Medallion [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	3,448	13,571
Strategic Partnership [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,331	$ 572
Percentage of Nonperforming to Total	0.00%	0.00%
Strategic Partnership [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,331	$ 572
Strategic Partnership [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 0	$ 0