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INVESTMENT SECURITIES (Narrative) (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
security
Sep. 30, 2023
USD ($)
security
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
investment
security
shares
Dec. 31, 2021
USD ($)
EQUITY          
Investment securities classified from available-for-sale to held-to-maturity | investment       81  
Cost basis of AFS securities sold $ 30,000,000     $ 762,700,000  
Fair market value of AFS securities sold       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     $ 7,440,000 4,295,000 $ 0
Number of AFS securities sold | security 17        
Debt securities available-for-sale, at fair value $ 647,210,000   647,210,000 671,794,000  
Proceeds from sales of available-for-sale and equity investment securities 28,100,000       279,500,000
Gross realized losses 1,900,000       3,200,000
Gross realized gains 0       3,400,000
Purchases of available-for-sale investment securities $ 28,300,000   47,393,000 89,058,000 1,071,360,000
Net gains (losses) on sales of investment securities     $ (2,074,000) $ 8,506,000 150,000
Proceeds from sale of equity method in investment securities         $ 1,700,000
Number of AFS investment securities in an unrealized loss position | security 208   208 243  
Number of HTM investment securities in an unrealized loss position | security 82   82 83  
Common stock, value $ 405,439,000   $ 405,439,000 $ 408,071,000  
Common Class B | Visa          
EQUITY          
Shares owned (in shares) | shares       34,631  
Common stock, value       $ 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   14,956,000 1,507,000  
Proceeds from sales of available-for-sale and equity investment securities   $ 1,400,000      
Gain (loss) on sale of AFS securities   $ (100,000)      
Collateralized Mortgage-Backed Securities | Asset Pledged as Collateral without Right          
EQUITY          
Debt securities available-for-sale, at fair value $ 990,400,000   990,400,000 607,700,000  
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     $ (7,440,000) $ (6,218,000)