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LOANS HELD FOR INVESTMENT - Performance of Loans Modified During Period (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period | $ 3,483 | $ 6,769 | $ 39,475 | $ 126,897 | $ 59,020 | $ 129,103
Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period | 1,600 | 500 | 4,600 | 3,700 | 5,100 | 4,300
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period | 557 | 87 | 1,047 | 981 | 1,234 | 1,611
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period | 0 | 122 | 0 | 122 | 0 | 122
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period | 0 | 0 | 30,166 | 115,703 | 42,086 | 115,703
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period | 403 | 4,429 | 1,301 | 4,441 | 6,965 | 4,441
Consumer Portfolio Segment [Member] | Automobile Loan [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period | 1,377 | 1,037 | 3,243 | 3,023 | 4,123 | 4,075
Consumer Portfolio Segment [Member] | Personal Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period | 148 | 40 | 428 | 140 | 476 | 205
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period | 936 | 929 | 2,942 | 1,935 | 3,675 | 2,394
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period | $ 62 | $ 125 | $ 348 | $ 552 | 461 | 552
30-59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 663 | 290
30-59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
30-59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
30-59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
30-59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 9 | 0
30-59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 107 | 86
30-59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Personal Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 85 | 0
30-59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 421 | 172
30-59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 41 | 32
60-89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 444 | 239
60-89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 115 | 0
60-89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
60-89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
60-89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
60-89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 94 | 156
60-89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Personal Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 19 | 0
60-89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 206 | 46
60-89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 10 | 37
90 days or more Past Due [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 273 | 117
90 days or more Past Due [Member] | Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
90 days or more Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
90 days or more Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
90 days or more Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 17 | 0
90 days or more Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 99 | 82
90 days or more Past Due [Member] | Consumer Portfolio Segment [Member] | Personal Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
90 days or more Past Due [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 148 | 13
90 days or more Past Due [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 9 | 22
Total Delinquency [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 1,380 | 646
Total Delinquency [Member] | Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 115 | 0
Total Delinquency [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
Total Delinquency [Member] | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 0
Total Delinquency [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 26 | 0
Total Delinquency [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 300 | 324
Total Delinquency [Member] | Consumer Portfolio Segment [Member] | Personal Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 104 | 0
Total Delinquency [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 775 | 231
Total Delinquency [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 60 | 91
Current [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 57,640 | 128,457
Current [Member] | Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 1,119 | 1,611
Current [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 0 | 122
Current [Member] | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 42,086 | 115,703
Current [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 6,939 | 4,441
Current [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 3,823 | 3,751
Current [Member] | Consumer Portfolio Segment [Member] | Personal Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 372 | 205
Current [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | 2,900 | 2,163
Current [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Excluding Accrued Interest Modified Period |  |  |  |  | $ 401 | $ 461

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