Investment Securities - Pledged Securities (Details) - Asset Pledged as Collateral without Right - Deposits - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Investment Securities
Marketable securities	$ 114.4	$ 78.6
Debt securities, available-for-sale and held-to-maturity, amortized cost	$ 128.7	$ 78.8

Amount of investment in marketable security.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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