Income Taxes - Summary of Components of Deferred and Other Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Goodwill and other intangibles		$ (45,423)	$ (45,595)
Provision for loan losses		20,748	19,198
Net operating loss carryforwards	[1]	24,327	22,607
Accrued expenses, compensation, and other assets		1,701	1,701
Unrealized gains on other investments		(7,130)	(6,790)
Total deferred tax liability		(5,777)	(8,879)
Valuation allowance		(462)	(462)
Deferred tax liability, net		(6,239)	(9,341)
Taxes receivable		1,126	1,516
Net deferred and other tax liabilities		$ (5,113)	$ (7,825)

[1] As of March 31, 2020, the Company and its subsidiaries had an estimated $96,586 of net operating loss carryforwards, $1,712 of which expire at various dates between December 31, 2026 and December 31, 2035, which had a net asset value of $23,865 as of March 31, 2020.