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LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Collateral-Dependent Loans) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized cost	$ 80	$ 66
Commercial and industrial | Commercial: | Single family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized cost	$ 3
Weighted average LTV	75.00%
Owner-occupied | Commercial: | Industrial building
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized cost	$ 11
Weighted average LTV	69.00%
Owner-occupied | Commercial: | Retail facility
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized cost		$ 6
Weighted average LTV		64.00%
Municipal | Commercial: | Multifamily apartments
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized cost	$ 2	$ 5
Weighted average LTV	97.00%	174.00%
Term | Commercial real estate: | Office building
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized cost	$ 61	$ 49
Weighted average LTV	98.00%	98.00%
1-4 family residential | Consumer: | Single family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized cost	$ 3	$ 3
Weighted average LTV	42.00%	38.00%
Home equity credit line | Consumer: | Single family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized cost		$ 3
Weighted average LTV		29.00%

X

- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher SEC

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Amount of financing receivable individually evaluated for credit loss. Excludes financing receivable collectively evaluated for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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