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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)	3 Months Ended
	Mar. 31, 2025 officer segment reporting_unit office	Jul. 31, 2024 loan_production_office	Jul. 31, 2024 full_service_bank_branch
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of branch offices | office	14
Number of reportable segments	1
Number of reporting units | reporting_unit	1
Number of operating segments	1
CODM role share by executive officers | officer	4
Construction and Land Development
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maximum LTV ratio	75.00%
Construction and Land Development | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loan term	12 months
Construction and Land Development | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loan term	36 months
Consumer | Installment Loan
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loan term	5 years
CALB | Consumer | Minimum | Solar Loan
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loan term	6 years
CALB | Consumer | Maximum | Solar Loan
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loan term	23 years
CALB | Northern California
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of properties acquired		4	1
CALB | Southern California
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of properties acquired | full_service_bank_branch			13

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Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest, Loan Term

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