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LOANS AND LEASES - Summary of Loan Portfolio by Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for credit losses $ 186,126 $ 151,861 $ 94,507 $ 228,804
Net loans and leases 12,583,202 11,759,992    
Reverse mortgage, fair value 2,800 2,400 3,900  
Financing Receivable Portfolio Segment, Including Reverse Mortgages        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 12,769,328 11,911,853    
Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 870,705 761,882    
Allowance for credit losses 5,483 4,668 3,352 6,893
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 2,012,134 1,810,930    
Allowance for credit losses 58,543 53,320 23,088 18,160
Commercial and industrial | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 2,540,070 2,575,345    
Allowance for credit losses 64,564 59,394 49,967 150,875
Owner-occupied commercial | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,886,087 1,809,582    
Allowance for credit losses 10,719 6,019 4,574 9,615
Commercial mortgages | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 3,801,180 3,351,084    
Allowance for credit losses 36,055 21,473 11,623 31,071
Construction | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,035,530 1,044,049    
Allowance for credit losses 10,762 6,987 $ 1,903 $ 12,190
Commercial small business leases | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 623,622 $ 558,981