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DEPOSITS - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Jul. 31, 2024
Deposit Liability [Line Items]
Deposit contracts, liabilities	$ 5,000.0
ICS deposits	$ 763.6	$ 754.4
Percent of total deposits	22.80%	22.20%
Percentage of bank liabilities	0.226
Reciprocal deposits			$ 442.7
Time deposits exceeding FDIC insurance limit	$ 83.0	$ 80.6
Brokered time deposits	13.8	121.1
Asset Pledged as Collateral | Letter of Credit
Deposit Liability [Line Items]
Collateralized deposits	$ 27.1	$ 25.1
IntraFi Network Insured Cash Sweep ICS
Deposit Liability [Line Items]
Reciprocal deposits			98.4
Reich & Tang Deposit Solutions R&T Network
Deposit Liability [Line Items]
Reciprocal deposits			306.6
Certificate of Deposit Account Registry Service CDARS
Deposit Liability [Line Items]
Reciprocal deposits			$ 37.7

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Deposits, Interest-Bearing Money Market Deposits and Savings Account Deposits, Insured Cash Sweep (ICS)

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Deposits, Interest-Bearing Money Market Deposits And Savings Account Deposits, Reciprocal Deposits

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Percentage of Interest-Bearing Domestic Deposits to Bank Liabilities

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Carrying amount of liabilities as of the balance sheet date pertaining to amounts received by the insurer or reinsurer from the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

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Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

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Percentage of interest-bearing domestic deposit liabilities to total deposit liabilities.

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Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

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