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BORROWING ARRANGEMENTS - Narrative (Details)
$ in Thousands
Jul. 31, 2024
USD ($)
May 28, 2020
USD ($)
Mar. 31, 2025
USD ($)
lineOfCredit
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]        
FHLB secured line of credit     $ 734,800  
FHLB secured line of credit, amount available     687,800  
Loans pledge with FHLB under blanket lien     2,180,000  
Loans held for investment     3,068,774 $ 3,139,165
FHLB advances     0 0
Federal Reserve secured line of credit     353,000  
Held-to-maturity debt securities pledged as collateral     53,194 53,280
Amortized cost of debt securities available-for-sale, at fair value     137,855 151,429
Discount window borrowings     0 0
Fixed-to-Floating Rate Subordinated Notes Due 2030        
Debt Instrument [Line Items]        
Basis spread on variable interest rate   3.50%    
Debt instrument face amount   $ 18,000    
Subordinated notes interest rate   5.50%    
Issuance costs   $ 475 16 40
Fixed amortization term   5 years    
Subordinated Debt | Subordinated Debt, 3.50% Maturing In September 2031        
Debt Instrument [Line Items]        
Basis spread on variable interest rate 2.86%      
Debt instrument face amount $ 35,000      
Interest rate 3.50%      
Debt instrument, unamortized discount $ 3,400   2,300 2,700
Subordinated Debt | CALB | Subordinated Debt, 5.00% Maturing In September 2030        
Debt Instrument [Line Items]        
Basis spread on variable interest rate 4.88%      
Debt instrument face amount $ 20,000      
Interest rate 5.00%      
Debt instrument, unamortized discount $ 794   $ 340 509
Overnight Unsecured Line of Credit | Line of Credit        
Debt Instrument [Line Items]        
Number of overnight unsecured credit lines | lineOfCredit     4  
Overnight unsecured credit lines     $ 90,500  
Overnight unsecured credit lines, outstanding borrowings     0 $ 0
Asset Pledged as Collateral | Federal Home Loan Bank Advances        
Debt Instrument [Line Items]        
FHLB secured line of credit, amount available     47,000  
Loans held for investment     1,330,000  
Asset Pledged as Collateral | Federal Reserve Bank Advances        
Debt Instrument [Line Items]        
Loans held for investment     363,000  
Held-to-maturity debt securities pledged as collateral     53,200  
Asset Pledged as Collateral | Deposits        
Debt Instrument [Line Items]        
Amortized cost of debt securities available-for-sale, at fair value     $ 3,000