Loans and Allowance for Credit Losses - Summary of Allowance for Loan Losses by Type (Detail) - USD ($) $ in Thousands	Mar. 31, 2024		Dec. 31, 2023		Mar. 31, 2023	[1]	Dec. 31, 2022	[2]
Financing Receivable Recorded Investment Past Due [Line Items]
Amount	$ 83,827	[1]	$ 84,235	[2]	$ 70,280		$ 63,845
Percentage of Allowance	100.00%		100.00%
Allowance as a Percent of Loan Category	3.76%		3.80%
Allowance as a Percent of Nonaccrual	383.10%		324.31%
Recreation [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Amount	$ 60,011		$ 57,532
Percentage of Allowance	72.00%		68.00%
Allowance as a Percent of Loan Category	4.40%		4.31%
Allowance as a Percent of Nonaccrual	274.26%		221.50%
Home Improvement [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Amount	$ 17,930		$ 21,019
Percentage of Allowance	21.00%		25.00%
Allowance as a Percent of Loan Category	2.38%		2.76%
Allowance as a Percent of Nonaccrual	81.94%		80.92%
Commercial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Amount	$ 4,384		$ 4,148
Percentage of Allowance	5.00%		5.00%
Allowance as a Percent of Loan Category	4.11%		3.61%
Allowance as a Percent of Nonaccrual	20.04%		15.97%
Taxi Medallion [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Amount	$ 1,502		$ 1,536
Percentage of Allowance	2.00%		2.00%
Allowance as a Percent of Loan Category	42.20%		41.93%
Allowance as a Percent of Nonaccrual	6.86%		5.91%

[1] As of March 31, 2024 and March 31, 2023, there were no allowance for credit losses and net charge-offs related to the strategic partnership loans.

[2] 2023 beginning balance represents allowance prior to the adoption of ASU 2016-13.