Loans and Allowance for Credit Losses - Summary of Performance Status of Loans and Loans Held for Sale (Detail) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2025		Dec. 31, 2024	Jun. 30, 2024
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 2,412,561		$ 2,362,796
Net loans	$ 2,485,051	[1]	$ 2,491,022	$ 2,385,590
Percentage of Nonperforming to Total	1.49%		1.34%
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	$ 2,447,946		$ 2,457,669
Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Net loans	37,105		33,353
Recreation [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,546,252		$ 1,543,243
Percentage of Nonperforming to Total	0.51%		0.70%
Recreation [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,538,323		$ 1,532,448
Recreation [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	7,929		10,795
Home Improvement [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 803,535		$ 827,211
Percentage of Nonperforming to Total	0.16%		0.17%
Home Improvement [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 802,237		$ 825,825
Home Improvement [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	1,298		1,386
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 121,415		$ 111,273
Percentage of Nonperforming to Total	21.67%		17.31%
Commercial [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 95,101		$ 92,010
Commercial [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	26,314		19,263
Taxi Medallion [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 1,564		$ 1,909
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	1,564		1,909
Strategic Partnership [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 12,285		$ 7,386
Percentage of Nonperforming to Total	0.00%		0.00%
Strategic Partnership [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 12,285		$ 7,386
Strategic Partnership [Member] | Non - Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Status of loans	$ 0		$ 0

[1] Inclusive of recreation and strategic partnership loans held for sale, at lower of amortized cost or fair value.