Income Taxes - Summary of Components of Deferred and Other Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Goodwill and other intangibles		$ (43,509)	$ (43,894)
Provision for loan losses		10,360	11,057
Net operating loss carryforwards	[1]	3,570	12,167
Accrued expenses, compensation, and other assets		4,042	2,579
Unrealized gains on other investments		1,700	2,176
Total deferred tax liability		(23,837)	(15,915)
Valuation allowance		(2,295)	(2,295)
Deferred tax liability, net		$ (26,132)	$ (18,210)

[1] As of September 30, 2022, the Company and its subsidiaries had an estimated $10.9 million of net operating loss carryforwards, $1.7 million of which expires at various dates between December 31, 2026 and December 31, 2035, which had a net carrying value of $1.3 million as of September 30, 2022.