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Credit Losses - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' equity	$ 319,182		$ 250,031	$ 182,498	$ 210,528
Retained Earnings
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' equity	$ 269,420		173,371	$ 105,212	48,434
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' equity			(1,190)		2,142
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' equity			$ (1,190)		$ 2,030
Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Line Items]
Cumulative effect on retained earnings, tax		$ 400
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' equity		$ (1,200)

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

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