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LOANS AND LEASES - Additional Information (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Loan
Dec. 31, 2025
USD ($)
Financing Receivable Recorded Investment Past Due [Line Items]    
Loans amount $ 6,432,392,000 $ 6,251,972,000
Loans on nonaccrual status 59,321,000 68,243,000
Loan receivable, validate risk ratings performed for large sample or new lending to existing relationships 1,000,000  
Loan receivable, validate risk ratings performed for criticized and classified rated borrowers with relationship exposure, value 500,000  
Loan receivable, validate risk ratings performed for new federal reserve board regulation "O" loan commitments, value 1,000,000  
Loan receivable validate risk ratings performed for leveraged loans, value 1,000,000  
Loan receivable validate risk ratings performed for no borrower with commitments, value 500,000  
Primary Residential Mortgages [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Financing receivable modified in period amount 82,000  
60 to 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Loans amount 40,747,000 10,564,000
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Financing receivable increase in special mention loans 36,200,000  
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Loans amount 1,875,403,000 1,823,557,000
Loans on nonaccrual status 13,377,000 22,641,000
Multifamily Loans [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Financing receivable modified in period amount 1,200,000  
Commercial and Industrial Loans [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Financing receivable modified in period amount 2,300,000  
Substandard [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Loans amount 90,583,000 118,912,000
Financing receivable individually evaluated loan 59,300,000 68,200,000
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Financing receivable increase in special mention loans 9,600,000  
Substandard [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Loans amount $ 37,695,000 $ 46,313,000
Substandard [Member] | Multifamily Loans [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Number of multifamily loans | Loan 1  
Minimum [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Loan receivable, validate risk ratings performed for large sample of borrowers with relationship, value $ 1,000,000  
Maximum [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Loan receivable, validate risk ratings performed for small sample of borrowers with relationship, value $ 1,000,000