Other Non-interest Income and Non-interest Expense - Summary of Other Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income and Expenses [Abstract]
Referral revenue		$ 4,293	$ 1,264	$ 9,649	$ 3,503
Realized losses on sales of securities available for sale and other investments		0	0	(96)	(1)
Other		2,029	1,851	9,117	6,664
Other non-interest income	[1]	$ 6,322	$ 3,115	$ 18,670	$ 10,166

[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.