Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS (Narrative) (Details)

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GOODWILL AND INTANGIBLE ASSETS (Narrative) (Details)
3 Months Ended
Mar. 31, 2024
USD ($)
segment
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Finite-Lived Intangible Assets [Line Items]      
Number of operating segments | segment 2    
Goodwill $ 925,211,000   $ 925,211,000
Intangible Assets 17,288,000   19,183,000
Impairment of goodwill or intangible assets 0    
Intangible assets, amortization expense 1,895,000 $ 2,279,000  
Wholesale Banking      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 639,180,000   639,180,000
Intangible Assets 1,238,000   1,302,000
Consumer Banking      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 286,031,000   286,031,000
Intangible Assets 936,000   989,000
Corporate Other      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 0   0
Intangible Assets $ 15,114,000   $ 16,892,000
Core Deposits | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, amortization period (years) 4 years    
Core Deposits | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, amortization period (years) 10 years    
Other amortizable intangibles | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, amortization period (years) 4 years    
Other amortizable intangibles | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, amortization period (years) 10 years