Loans and Allowance for Credit Losses - Summary of Performance Status of Loan (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 2,203,038	$ 1,916,953
Percentage of Nonperforming to Total	0.94%	1.70%
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 2,182,390	$ 1,884,403
Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	20,648	32,550
Recreation [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,346,440	$ 1,183,512
Percentage of Nonperforming to Total	0.48%	0.82%
Recreation [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,339,934	$ 1,173,846
Recreation [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	6,506	9,666
Home Improvement [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 750,508	$ 626,399
Percentage of Nonperforming to Total	0.13%	0.09%
Home Improvement [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 749,528	$ 625,820
Home Improvement [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	980	579
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 100,322	$ 92,899
Percentage of Nonperforming to Total	9.21%	9.40%
Commercial [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 91,087	$ 84,165
Commercial [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	9,235	8,734
Medallion [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 3,927	$ 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	3,927	13,571
Strategic Partnership [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,841	$ 572
Percentage of Nonperforming to Total	0.00%	0.00%
Strategic Partnership [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,841	$ 572
Strategic Partnership [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 0	$ 0