Regulatory Restrictions - Narrative (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Banking and Thrift [Abstract]
Restricted investment in bank	$ 590,672
Average reserve balance	$ 1,099

Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers).

No definition available.

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