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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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