FDIC Shared-Loss Payable - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered		$ 34,500
Payment made to the FDIC to settle shared-loss agreement	$ 99,500	(99,468)	$ 0
FDIC shared-loss payable		$ 15,601	$ 112,395		$ 105,618
Scenario, Forecast
Accounts, Notes, Loans and Financing Receivable [Line Items]
FDIC shared-loss payable				$ 15,900