v3.26.1
LOANS AND CREDIT QUALITY - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan receivables $ 13,576,196   $ 13,576,196   $ 14,176,936
Accrued interest receivable 51,500   51,500   $ 53,100
Premium on purchased loan and lease receivables $ 15 $ 159 $ 35 $ 201  
Commercial And Residential Real Estate Portfolio Segment | California          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percent of total loans 77.00%   77.00%   76.00%
Commercial real estate | Multifamily          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan receivables $ 5,223,356   $ 5,223,356   $ 5,355,252
Percent of total loans 38.00%   38.00%   38.00%
Residential real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan receivables $ 4,107,867   $ 4,107,867   $ 3,970,803
Percent of total loans 30.00%   30.00%   28.00%
Asset Pledged as Collateral | Federal Home Loan Bank Advances          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan receivables $ 10,200,000   $ 10,200,000    
Asset Pledged as Collateral | Federal Reserve Bank Discount Window          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan receivables $ 1,200,000   $ 1,200,000