Investment Securities - Securities Pledged (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Debt securities with carrying values, pledged	$ 169.0	$ 275.4

The value of assets other than financial instruments pledged to provide security to a suppler under a recorded unconditional purchase obligation arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

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