v3.26.3
SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Narrative (Details)
9 Months Ended
Sep. 30, 2026
USD ($)
period
Dec. 31, 2025
USD ($)
Debt Instrument [Line Items]    
Long-term debt $ 76,547,000 $ 76,547,000
Investment securities 1,341,412,000 1,310,603,000
Junior subordinated debentures    
Debt Instrument [Line Items]    
Long-term debt $ 51,547,000 51,547,000
Number of periods interest can be deferred | period 20  
Junior subordinated debentures | Maximum    
Debt Instrument [Line Items]    
Redemption period 90 days  
Federal Home Loan Bank Borrowings    
Debt Instrument [Line Items]    
Line of Credit, maximum borrowing capacity $ 1,880,000,000 1,800,000,000
Unused borrowings available 1,750,000,000 1,680,000,000
FHLB advances and other short-term borrowings 0 0
Long-term debt $ 25,000,000.0 $ 25,000,000.0
Long term borrowings, interest rate 4.02% 4.02%
Letters of Credit, outstanding $ 102,500,000 $ 95,600,000
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral    
Debt Instrument [Line Items]    
Net loans and leases 2,730,000,000 2,760,000,000
Federal Reserve discount window line of credit    
Debt Instrument [Line Items]    
Unused borrowings available 188,700,000 206,400,000
Federal Reserve discount window line of credit | Asset Pledged as Collateral    
Debt Instrument [Line Items]    
Net loans and leases 93,000,000.0 98,900,000
Investment securities 162,200,000 172,000,000.0
Pacific Coast Bankers' Bank ("PCBB")    
Debt Instrument [Line Items]    
Unused borrowings available $ 75,000,000.0 $ 75,000,000.0