Loans and Allowance for Credit Losses - Summary of Allowance for Loan Losses by Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2024		Mar. 31, 2024	[2]	Dec. 31, 2023		Jun. 30, 2023	[1]	Mar. 31, 2023	[2]	Dec. 31, 2022	[2]
Financing Receivable Recorded Investment Past Due [Line Items]
Amount	$ 89,788	[1]	$ 83,827		$ 84,235	[2]	$ 74,971		$ 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	403.58%				324.31%
Recreation [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Amount	$ 65,140				$ 57,532
Percentage of Allowance	73.00%				68.00%
Allowance as a Percent of Loan Category	4.35%				4.31%
Allowance as a Percent of Nonaccrual	292.79%				221.50%
Home Improvement [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Amount	$ 18,388				$ 21,019
Percentage of Allowance	20.00%				25.00%
Allowance as a Percent of Loan Category	2.38%				2.76%
Allowance as a Percent of Nonaccrual	82.65%				80.92%
Commercial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Amount	$ 4,861				$ 4,148
Percentage of Allowance	5.00%				5.00%
Allowance as a Percent of Loan Category	4.41%				3.61%
Allowance as a Percent of Nonaccrual	21.85%				15.97%
Taxi Medallion [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Amount	$ 1,399				$ 1,536
Percentage of Allowance	2.00%				2.00%
Allowance as a Percent of Loan Category	40.18%				41.93%
Allowance as a Percent of Nonaccrual	6.29%				5.91%

[1] As of June 30, 2024 and June 30, 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.