Income Taxes - Summary of Components of Deferred and Other Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Goodwill and other intangibles		$ (44,022)	$ (44,799)
Provision for loan losses		12,550	19,556
Net operating loss carryforwards	[1]	18,745	30,493
Accrued expenses, compensation, and other assets		2,309	1,174
Unrealized gains on other investments		(10)	(6,769)
Total deferred tax liability		(10,408)	(345)
Valuation allowance	[2]	(2,295)	(462)
Deferred tax liability, net		$ (12,703)	$ (807)

[1] As of September 30, 2021, the Company and its subsidiaries had an estimated $77,838 of net operating loss carryforwards, $1,712 of which expires at various dates between December 31, 2026 and December 31, 2035, which had a net carrying value of $16,450 as of September 30, 2021.

[2] During the nine months ended September 30, 2021, it was determined that the likelihood of utilization of certain net operating losses was remote and a valuation allowance of $1,833 was assessed against these assets.