Quarterly report [Sections 13 or 15(d)]

SUBSEQUENT EVENTS (Narrative) (Details)

v3.26.1
SUBSEQUENT EVENTS (Narrative) (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended
May 05, 2026
USD ($)
$ / shares
May 01, 2026
USD ($)
Apr. 01, 2025
USD ($)
shares
Mar. 31, 2026
USD ($)
$ / shares
Mar. 31, 2025
$ / shares
Dec. 31, 2025
USD ($)
$ / shares
Subsequent Event [Line Items]            
Dividends on common stock (in dollars per share)       $ 0.37 $ 0.34  
Dividends on preferred stock (in dollars per share)       171.88 $ 171.88  
Common stock, par value (in dollars per share)       $ 1.33   $ 1.33
Total assets | $       $ 37,315,011   $ 37,585,754
Total deposits | $       $ 30,391,256   $ 30,471,636
Sandy Spring            
Subsequent Event [Line Items]            
Conversion ratio     0.9      
Additional shares issued | shares     41.0      
Issuance of common stock in regard to acquisition | $     $ 1,275,969      
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Stock repurchase program, authorized amount | $ $ 250,000          
Stock repurchase program, expiration date May 05, 2027          
Subsequent Event [Member] | Bearing Insurance Group, LCC            
Subsequent Event [Line Items]            
Sale of Company's interest | $   $ 32,300        
Common Class A [Member] | O 2026 Q2 Common Dividends [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Dividends on common stock (in dollars per share) $ 0.37          
Dividends payable, date to be paid Jun. 05, 2026          
Dividends payable, date of record May 22, 2026          
Depositary Shares | O 2026 Q2 Preferred Dividends [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Dividends on preferred stock (in dollars per share) $ 0.43          
Series A Preferred Stock [Member]            
Subsequent Event [Line Items]            
Number of preferred stock represented by each depositary share       each representing a 1/400th ownership interest in a share of its Series A preferred stock    
Series A Preferred Stock [Member] | O 2026 Q2 Preferred Dividends [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Number of preferred stock represented by each depositary share each representing a 1/400th ownership interest in a share of Series A preferred stock.          
Dividends on preferred stock (in dollars per share) $ 171.88          
Dividends payable, date declared May 05, 2026          
Dividends payable, date to be paid Jun. 01, 2026          
Dividends payable, date of record May 15, 2026