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INVESTMENT SECURITIES (Narrative) (Details)
 1 Months Ended 12 Months Ended
Nov. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
shares
Sep. 30, 2023
USD ($)
security
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
investment
security
shares
Dec. 31, 2022
USD ($)
EQUITY            
Investment securities classified from available-for-sale to held-to-maturity | investment         81  
Cost basis of AFS securities sold $ 106,500,000 $ 30,000,000     $ 762,700,000  
Fair market value of AFS securities sold   $ 673,200,000     673,200,000  
Net unrealized loss from transfer of securities         89,500,000  
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value       $ 7,159,000 7,440,000 $ 4,295,000
Number of AFS securities sold | security 24 17        
Debt securities available-for-sale, at fair value   $ 647,210,000   737,658,000 647,210,000  
Proceeds from sales of available-for-sale and equity investment securities $ 96,600,000 28,100,000        
Gross realized losses 9,900,000 1,900,000        
Gross realized gains 0 0        
Purchases of available-for-sale investment securities $ 101,600,000 $ 28,300,000   253,580,000 47,393,000 89,058,000
Gain (loss) on sale of AFS securities     $ 100,000      
Net loss on sales of investment securities       $ (9,934,000) $ (2,074,000) 8,506,000
Number of AFS investment securities in an unrealized loss position | security   208   218 208  
Number of HTM investment securities in an unrealized loss position | security   82   83 82  
Common stock, value   $ 405,439,000   $ 404,494,000 $ 405,439,000  
Common Class B | Visa            
EQUITY            
Shares owned (in shares) | shares   34,631     34,631  
Common stock, value   $ 8,500,000     $ 8,500,000  
Commercial - Non-government agencies            
EQUITY            
Cost basis of AFS securities sold     $ 1,500,000      
Number of AFS securities sold | security     2      
Debt securities available-for-sale, at fair value   14,956,000   9,927,000 14,956,000  
Proceeds from sales of available-for-sale and equity investment securities     $ 1,400,000      
Collateralized Mortgage-Backed Securities | Asset Pledged as Collateral without Right            
EQUITY            
Debt securities available-for-sale, at fair value   $ 990,400,000   756,000,000.0 990,400,000  
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Noncontrolling Interest            
EQUITY            
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value       $ (7,159,000) $ (7,440,000) $ (6,218,000)