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LOANS HELD FOR INVESTMENT - Selected Information on TDRs includes Recorded Investment by Loan Class and Modification Type (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]
Loans modified to borrowers experiencing financial difficulty	$ 3,483	$ 6,769	$ 39,475	$ 126,897	$ 59,020	$ 129,103
Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	196	0
Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	439	87	686	0
Change in Amortization term [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	30,166	766
Interest Rate [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	936	943	2,942	1,961
Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	878	575	2,229	116,984
Combination of Interest Rate Reduction And Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	288	4,183	777	4,620
Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	942	981	2,479	2,566
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 557	$ 87	$ 1,047	$ 981	1,234	1,611
Percentage of Total by Portfolio Classes	0.02%	0.00%	0.04%	0.04%
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0	$ 0	$ 0
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	411	87	538	0
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Change in Amortization term [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	766
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Interest Rate [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	146	0	509	157
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Combination of Interest Rate Reduction And Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	58
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 122	$ 0	$ 122	0	122
Percentage of Total by Portfolio Classes	0.00%	0.06%	0.00%	0.06%
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Change in Amortization term [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Interest Rate [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	122	0	122
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Combination of Interest Rate Reduction And Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0	$ 30,166	$ 115,703	42,086	115,703
Percentage of Total by Portfolio Classes	0.00%	0.00%	1.18%	4.68%
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Change in Amortization term [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	30,166	0
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Interest Rate [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	115,703
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Combination of Interest Rate Reduction And Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 403	$ 4,429	$ 1,301	$ 4,441	6,965	4,441
Percentage of Total by Portfolio Classes	0.01%	0.14%	0.04%	0.14%
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0	$ 196	$ 0
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Change in Amortization term [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Interest Rate [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	14	0	26
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	403	335	1,008	335
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Combination of Interest Rate Reduction And Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	4,058	80	4,058
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	22	17	22
Consumer Portfolio Segment [Member] | Auto loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 1,377	$ 1,037	$ 3,243	$ 3,023	4,123	4,075
Percentage of Total by Portfolio Classes	0.07%	0.05%	0.16%	0.15%
Consumer Portfolio Segment [Member] | Auto loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment [Member] | Auto loans [Member] | Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Auto loans [Member] | Change in Amortization term [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Auto loans [Member] | Interest Rate [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Auto loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	282	41	525	319
Consumer Portfolio Segment [Member] | Auto loans [Member] | Combination of Interest Rate Reduction And Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	168	37	290	192
Consumer Portfolio Segment [Member] | Auto loans [Member] | Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	927	959	2,428	2,512
Consumer Portfolio Segment [Member] | Personal Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 148	$ 40	$ 428	$ 140	476	205
Percentage of Total by Portfolio Classes	0.04%	0.01%	0.13%	0.04%
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	28	0	28	0
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Change in Amortization term [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Interest Rate [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	63	13
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Combination of Interest Rate Reduction And Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	120	40	337	127
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 936	$ 929	$ 2,942	$ 1,935	3,675	2,394
Percentage of Total by Portfolio Classes	0.32%	0.29%	1.00%	0.60%
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Change in Amortization term [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Interest Rate [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	936	929	2,942	1,935
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Combination of Interest Rate Reduction And Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 62	$ 125	$ 348	$ 552	$ 461	$ 552
Percentage of Total by Portfolio Classes	0.04%	0.08%	0.24%	0.37%
Consumer Portfolio Segment [Member] | Other Loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	120	0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Change in Amortization term [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Interest Rate [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	47	77	124	335
Consumer Portfolio Segment [Member] | Other Loans [Member] | Combination of Interest Rate Reduction And Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	48	70	185
Consumer Portfolio Segment [Member] | Other Loans [Member] | Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 15	$ 0	$ 34	$ 32

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- Definition

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+ References

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