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Deposits (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Affiliate company deposits | Assets pledged as collateral
Cash and Cash Equivalents
Deposit liabilities uninsured by FDIC	$ 1.2
Retail accounts
Cash and Cash Equivalents
Percentage of deposit held	42.80%
Commercial accounts
Cash and Cash Equivalents
Percentage of deposit held	33.50%
Municipal relationships
Cash and Cash Equivalents
Percentage of deposit held	15.60%
Municipal relationships | Collateralized by letters of credit
Cash and Cash Equivalents
Letters of credit pledged as collateral	$ 345.8
Brokered deposits
Cash and Cash Equivalents
Percentage of deposit held	8.10%
Deposit uninsured by FDIC
Cash and Cash Equivalents
Deposit liabilities uninsured by FDIC	$ 798.6	$ 883.5
Percentage of deposit held	24.90%	26.90%

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+ 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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