Commitments and Contingent Liabilities - Commitments to Extend Credit, Participations Sold (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Commitments to extend credit
Commitments
Participations sold to other institutions	$ 81.2	$ 93.1
Standby letters of credit
Commitments
Participations sold to other institutions	$ 10.8	$ 11.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration