Servicing Assets - Unpaid Principal Balances of Loans Serviced for Others (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loan portfolios serviced for:
Unpaid principal balances of loans serviced	$ 1,568,990	$ 1,531,256
SBA guaranteed loans
Loan portfolios serviced for:
Unpaid principal balances of loans serviced	1,422,478	1,395,713
USDA guaranteed loans
Loan portfolios serviced for:
Unpaid principal balances of loans serviced	$ 146,512	$ 135,543

This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

Name:	us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant