Loans and Allowance for Credit Losses - Summary of Performance Status of Loan (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 2,385,590	$ 2,215,886	$ 2,156,998
Percentage of Nonperforming to Total	0.93%	1.17%
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 2,363,342	$ 2,189,912
Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	22,248	25,974
Recreation [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,497,428	$ 1,336,226
Percentage of Nonperforming to Total	0.43%	0.72%
Recreation [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,490,965	$ 1,326,567
Recreation [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	6,463	9,659
Home Improvement [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 773,184	$ 760,617
Percentage of Nonperforming to Total	0.17%	0.20%
Home Improvement [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 771,881	$ 759,128
Home Improvement [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	1,303	1,489
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 110,197	$ 114,827
Percentage of Nonperforming to Total	9.98%	9.72%
Commercial [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 99,197	$ 103,664
Commercial [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	11,000	11,163
Taxi Medallion [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 3,482	$ 3,663
Percentage of Nonperforming to Total	100.00%	100.00%
Taxi Medallion [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 0	$ 0
Taxi Medallion [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	3,482	3,663
Strategic Partnership [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,299	$ 553
Percentage of Nonperforming to Total	0.00%	0.00%
Strategic Partnership [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,299	$ 553
Strategic Partnership [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 0	$ 0