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LOANS HELD FOR INVESTMENT - Financial Effects of the Permanent Modifications Granted to Borrowers Experiencing Financial Difficulty (Details) - Permanent Modification [Member] | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.00% | 0.00% | 0.00% | 0.00%
Weighted-Average Term Extension (in months) |  | 236 months | 66 months | 236 months
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Combination of Reduction in Interest Rate and Extension of Maturity [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.00% | 0.50% | 0.00% | 3.50%
Weighted-Average Term Extension (in months) |  | 256 months |  | 36 months
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.00% | 0.00% | 0.00% | 0.00%
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Combination of Reduction in Interest Rate and Extension of Maturity [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.00% | 0.00% | 0.00% | 0.00%
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.00% | 0.00% | 0.00% | 0.00%
Weighted-Average Term Extension (in months) | 60 months | 96 months | 60 months | 96 months
Change in Amortization Term | 36 months |  | 36 months |
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Combination of Reduction in Interest Rate and Extension of Maturity [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.00% | 0.00% | 0.00% | 0.00%
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.00% | 0.00% | 14.22% | 13.00%
Weighted-Average Term Extension (in months) |  |  | 120 months |
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Combination of Reduction in Interest Rate and Extension of Maturity [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.50% | 0.00% | 0.50% | 0.00%
Weighted-Average Term Extension (in months) | 120 months |  | 120 months |
Consumer Portfolio Segment [Member] | Automobile Loan [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.00% | 0.00% | 0.00% | 0.00%
Weighted-Average Term Extension (in months) | 22 months | 21 months | 24 months | 26 months
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Combination of Reduction in Interest Rate and Extension of Maturity [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 3.55% | 3.29% | 2.91% | 2.57%
Weighted-Average Term Extension (in months) | 19 months | 28 months | 18 months | 28 months
Consumer Portfolio Segment [Member] | Personal Loans [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.00% | 0.00% | 0.00% | 0.00%
Weighted-Average Term Extension (in months) | 22 months |  | 23 months | 25 months
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Combination of Reduction in Interest Rate and Extension of Maturity [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 4.90% | 2.99% | 4.49% | 3.44%
Weighted-Average Term Extension (in months) | 22 months | 19 months | 22 months | 17 months
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 15.72% | 17.55% | 15.79% | 17.11%
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Combination of Reduction in Interest Rate and Extension of Maturity [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.00% | 0.00% | 0.00% | 0.00%
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 0.00% | 0.00% | 0.00% | 0.00%
Weighted-Average Term Extension (in months) | 31 months | 26 months | 27 months | 24 months
Consumer Portfolio Segment [Member] | Other Loans [Member] | Combination of Reduction in Interest Rate and Extension of Maturity [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction (%) | 2.97% | 3.34% | 3.25% | 3.31%
Weighted-Average Term Extension (in months) | 25 months | 17 months | 21 months | 17 months

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- 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://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-34 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-33 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 + Details
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