Income Taxes - Summary of Components of Deferred and Other Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Goodwill and other intangibles		$ (45,288)	$ (45,595)
Provision for loan losses		23,298	19,198
Net operating loss carryforwards	[1]	22,736	22,607
Accrued expenses, compensation, and other assets		1,886	1,701
Unrealized gains on other investments		(7,732)	(6,790)
Total deferred tax liability		(5,100)	(8,879)
Valuation allowance		(462)	(462)
Deferred tax liability, net		(5,562)	(9,341)
Taxes receivable		977	1,516
Net deferred and other tax liabilities		$ (4,585)	$ (7,825)

[1] As of June 30, 2020, the Company and its subsidiaries had an estimated $90,204 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 carrying value of $22,274 as of June 30, 2020.