Loans and Allowance for Credit Losses - Summary of Performance Status of Loan (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 2,228,426	$ 2,215,886
Percentage of Nonperforming to Total	0.98%	1.17%
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 2,206,545	$ 2,189,912
Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	21,881	25,974
Recreation [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,365,165	$ 1,336,226
Percentage of Nonperforming to Total	0.50%	0.72%
Recreation [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,358,293	$ 1,326,567
Recreation [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	6,872	9,659
Home Improvement [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 752,262	$ 760,617
Percentage of Nonperforming to Total	0.18%	0.20%
Home Improvement [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 750,903	$ 759,128
Home Improvement [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	1,359	1,489
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 106,570	$ 114,827
Percentage of Nonperforming to Total	9.47%	9.72%
Commercial [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 96,480	$ 103,664
Commercial [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	10,090	11,163
Taxi Medallion [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 3,560	$ 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	3,560	3,663
Strategic Partnership [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 869	$ 553
Percentage of Nonperforming to Total	0.00%	0.00%
Strategic Partnership [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 869	$ 553
Strategic Partnership [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 0	$ 0