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Organization - Narrative (Details) $ in Thousands	3 Months Ended			9 Months Ended
Organization - Narrative (Details) $ in Thousands	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) bank_branch	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Retained earnings \| $	$ 880,305			$ 880,305		$ 409,391
Allowance for credit losses \| $	279,804	$ 300,171	$ 442,537	279,804	$ 442,537	$ 433,752	$ 381,621	$ 181,973	$ 174,646
Goodwill impairment \| $	$ 0	$ 0	$ 0	$ 0	$ 1,470,000
CALIFORNIA
Business Acquisition [Line Items]
Retail branch locations \| bank_branch				69
NORTH CAROLINA
Business Acquisition [Line Items]
Retail branch locations \| bank_branch				1
COLORADO
Business Acquisition [Line Items]
Retail branch locations \| bank_branch				1

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

The cumulative amount of the reporting entity's undistributed earnings or deficit.