Summary of Significant Accounting Policies - Summary of Finalized Adoption Related to Allowance for Credit Losses on Loans (Detail) - USD ($) $ in Thousands	Jan. 01, 2023	Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans		$ 63,845
Recreation [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans		41,966
Home Improvement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans		11,340
Commercial [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans		1,049
Taxi Medallion [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans		9,490
Strategic Partnership [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans		$ 0
Effect of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	$ 13,712
Effect of ASC 326 Adoption | Recreation [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	10,037
Effect of ASC 326 Adoption | Home Improvement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	1,518
Effect of ASC 326 Adoption | Commercial [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	2,157
Effect of ASC 326 Adoption | Taxi Medallion [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	0
Effect of ASC 326 Adoption | Strategic Partnership [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	0
December 31, 2022 Pre-Topic 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	77,557
December 31, 2022 Pre-Topic 326 Adoption | Recreation [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	52,003
December 31, 2022 Pre-Topic 326 Adoption | Home Improvement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	12,858
December 31, 2022 Pre-Topic 326 Adoption | Commercial [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	3,206
December 31, 2022 Pre-Topic 326 Adoption | Taxi Medallion [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	9,490
December 31, 2022 Pre-Topic 326 Adoption | Strategic Partnership [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans	$ 0