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Deposits (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Affiliate company deposits | Assets pledged as collateral
Cash and Cash Equivalents [Line Items]
Deposit liabilities uninsured by FDIC	$ 1.7
Retail accounts
Cash and Cash Equivalents [Line Items]
Percentage of deposit held	43.90%
Commercial accounts
Cash and Cash Equivalents [Line Items]
Percentage of deposit held	33.40%
Municipal relationships
Cash and Cash Equivalents [Line Items]
Percentage of deposit held	14.40%
Municipal relationships | Collateralized by letters of credit
Cash and Cash Equivalents [Line Items]
Letters of credit pledged as collateral	$ 344.6
Brokered deposits
Cash and Cash Equivalents [Line Items]
Percentage of deposit held	8.40%
Deposit uninsured by FDIC
Cash and Cash Equivalents [Line Items]
Percentage of deposit held	25.40%	36.90%
Deposit liabilities uninsured by FDIC	$ 820.6	$ 1,100.0

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- Definition

Amount of deposit liabilities uninsured by FDIC.

+ References

No definition available.

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- Definition

Percentage of deposit held.

+ References

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- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480848/942-470-50-3

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