Business Acquisition - Consideration (Details) - USD ($) $ / shares in Units, $ in Thousands			9 Months Ended
		Jan. 29, 2021	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Cash paid	[1]		$ 145,344	$ 0
Radius Bancorp, Inc. Merger
Business Acquisition [Line Items]
Cash paid		$ 140,256
Fair value of common stock issued		40,808
Consideration related to share-based payments		5,742
Total consideration paid		$ 186,806
Business acquisition, number of shares issued (in shares)		3,761,114
Radius Bancorp, Inc. Merger | LendingClub
Business Acquisition [Line Items]
LendingClub share price (in dollars per share)		$ 10.85

[1] Prior period amounts have been reclassified to conform to the current period presentation. See “Notes to Condensed Consolidated Financial Statements – Note 1. Summary of Significant Accounting Policies” for additional information.