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Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Deposit Liability [Line Items]
Customer deposits	$ 277,600	$ 245,600
Contractual deposits with maturities within 1 year	200,000	250,000
Interest-bearing money market deposits	689,500	727,500
HSA deposits	4,574,000	4,200,000
Short-term deposits	$ 5,741,000	$ 5,423,100
Weighted average cost of funds on contractual deposits outstanding (as a percent)	3.85%	4.00%
Weighted average cost of interest-bearing money market deposits outstanding (as a percent)	3.79%	3.79%
Weighted average cost of HSA deposits outstanding (as a percent)	0.11%	0.11%
Maximum
Deposit Liability [Line Items]
Certificates of deposit, denominations	$ 250	$ 250

X

- Definition

The current portion, due within one year or one operating cycle, if longer, of deposits held other than customer deposits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph a
-Subparagraph (2)
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1406
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-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
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-Section 1406
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-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher SEC

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1406
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-Subparagraph (3)
-Publisher SEC

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph a
-Subparagraph (4)
-Publisher SEC

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X

- Definition

Amount of interest-bearing domestic money market demand account deposit liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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X

- Definition

The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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- Definition

The weighted average interest rate for domestic certificates of deposit liabilities.

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- Definition

The weighted average interest rate for domestic money market demand account deposit liabilities.

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- Definition

Certificate of Deposits Maturities, Year One

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- Definition

Certificates of Deposits Denominations in Dollar Amount

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- Definition

Deposits, HSA

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- Definition

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+ References

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