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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) office reportingUnit	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
New Accounting Pronouncement Early Adoption [Line Items]
Number of offices in which entity operates | office	52
Accrued interest receivable on securities available for sale	$ 8,000
Debt securities, available-for-sale, accrued interest, after allowance for credit loss, statement of financial position	Accrued interest receivable
Accrued interest receivable	$ 27,600	$ 30,400
Remaining lease term in which lease is evaluated for renewal	2 years
Other real estate owned	$ 7,500
Percentage of recognition threshold for which the largest amount of tax benefit is realized upon ultimate settlement with the related tax authority	50.00%
Number of reportable segments | reportingUnit	1
401 (k) Benefit Plan
New Accounting Pronouncement Early Adoption [Line Items]
Employee contributions match	6.00%
Employer contribution amount	$ 5,700	$ 5,500	$ 5,000
Minimum
New Accounting Pronouncement Early Adoption [Line Items]
Premises and equipment, useful life	3 years
Minimum | Core Deposit Intangibles
New Accounting Pronouncement Early Adoption [Line Items]
Intangibles, useful life	7 years
Minimum | Collateral Dependent Loans Specific Allocation of Allowance for Credit Losses on Loans
New Accounting Pronouncement Early Adoption [Line Items]
Percentage of estimated selling and closing costs of collateral	5.00%
Maximum
New Accounting Pronouncement Early Adoption [Line Items]
Premises and equipment, useful life	39 years
Maximum | Core Deposit Intangibles
New Accounting Pronouncement Early Adoption [Line Items]
Intangibles, useful life	10 years
Maximum | Collateral Dependent Loans Specific Allocation of Allowance for Credit Losses on Loans
New Accounting Pronouncement Early Adoption [Line Items]
Percentage of estimated selling and closing costs of collateral	10.00%
Financial Asset Acquired with Credit Deterioration
New Accounting Pronouncement Early Adoption [Line Items]
PCD loan value	$ 13,800
Allowance for credit losses	$ 267
Houston Region
New Accounting Pronouncement Early Adoption [Line Items]
Number of offices in which entity operates | office	35
Beaumont
New Accounting Pronouncement Early Adoption [Line Items]
Number of offices in which entity operates | office	16
Dallas
New Accounting Pronouncement Early Adoption [Line Items]
Number of offices in which entity operates | office	1

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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