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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		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 3,017	$ 2,559	$ 146,136	$ 40,135
Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	201	0
Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	95	464
Payment Plan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0
Interest Rate [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	986	570
Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	736	328
Combination of Interest Rate Reduction And Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	203	137
Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	796	1,060
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 212	$ 464	981	1,679
Percentage of Total by Portfolio Classes	0.01%	0.02%
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
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	95	464
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Payment Plan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0
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
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	117	0
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
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
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0	119	0
Percentage of Total by Portfolio Classes	0.00%	0.00%
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 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
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Payment Plan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	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
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0
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
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
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0	126,974	32,384
Percentage of Total by Portfolio Classes	0.00%	0.00%
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 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
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Payment Plan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	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
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
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
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
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 553	$ 13	10,529	375
Percentage of Total by Portfolio Classes	0.02%	0.00%
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 201	$ 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
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Payment Plan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	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	21	13
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	331	0
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	0
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	0
Consumer Portfolio Segment [Member] | Auto loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 1,056	$ 1,335	3,642	3,271
Percentage of Total by Portfolio Classes	0.05%	0.07%
Consumer Portfolio Segment [Member] | Auto loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 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
Consumer Portfolio Segment [Member] | Auto loans [Member] | Payment Plan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	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
Consumer Portfolio Segment [Member] | Auto loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	205	174
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	55	125
Consumer Portfolio Segment [Member] | Auto loans [Member] | Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	796	1,036
Consumer Portfolio Segment [Member] | Personal Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 98	$ 28	267	340
Percentage of Total by Portfolio Classes	0.03%	0.01%
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 0
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0	0
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Payment Plan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	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	9
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	7	14
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	91	5
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
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 965	$ 548	3,085	1,553
Percentage of Total by Portfolio Classes	0.32%	0.17%
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 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
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Payment Plan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	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	965	548
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
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
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
Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 133	$ 171	$ 539	$ 533
Percentage of Total by Portfolio Classes	0.09%	0.11%
Consumer Portfolio Segment [Member] | Other Loans [Member] | Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 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
Consumer Portfolio Segment [Member] | Other Loans [Member] | Payment Plan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	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
Consumer Portfolio Segment [Member] | Other Loans [Member] | Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	76	140
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	57	7
Consumer Portfolio Segment [Member] | Other Loans [Member] | Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0	$ 24

X

- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
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