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REGULATORY CAPITAL AND DIVIDENDS - Narrative (Details)
 12 Months Ended
Apr. 01, 2022
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Jan. 27, 2021
USD ($)
shares
Nov. 01, 2013
USD ($)
investor
Restructuring Cost and Reserve [Line Items]                
Private debt issuance, number of institutional investors | investor               4
Debt face amount               $ 70,000,000
Repayment of borrowings   $ 509,708,000 $ 1,119,200,000 $ 1,332,889,000        
Dividends available   283,400,000            
Dividend reinvestment and stock purchase plan, stockholder's maximum amount of cash payments per quarter in purchase of common stock   $ 5,000            
Cash dividends on preferred stock (in dollars per share) | $ / shares   $ 187.52 $ 187.52 $ 140.64        
Cash dividends on preferred stock   $ 1,875,000 $ 1,875,000 $ 1,406,000        
Stock Repurchase Program                
Restructuring Cost and Reserve [Line Items]                
Stock authorized to be repurchased (in shares) | shares             3,333,000  
Stock authorized to be repurchased (in shares)             $ 100,000,000  
Percent of outstanding shares             6.00%  
Common stock repurchased (in shares) | shares   1,648,466            
Available to repurchase (in shares) | shares   1,000,000            
Available to repurchase   $ 18,400,000            
Excise tax   $ 500,000            
Series A Preferred Stock                
Restructuring Cost and Reserve [Line Items]                
Preferred Stock, issued (in shares) | shares   10,000 10,000          
Liquidation value per share (in dollars per share) | $ / shares   $ 2,500 $ 2,500          
Cash dividends on preferred stock (in dollars per share) | $ / shares   187.52 187.52          
Depository share dividends (in dollars per share) | $ / shares   $ 1.88 $ 1.88          
Cash dividends on preferred stock   $ 1,900,000 $ 1,900,000          
Series A Preferred Stock | Level One                
Restructuring Cost and Reserve [Line Items]                
Preferred Stock, issued (in shares) | shares 10,000              
Dividend rate, percentage 7.50%              
Liquidation value per share (in dollars per share) | $ / shares $ 2,500              
Outstanding preferred stock   $ 25,000,000 $ 25,000,000          
Senior Notes                
Restructuring Cost and Reserve [Line Items]                
Private debt issuance, number of institutional investors | investor               4
Debt face amount               $ 70,000,000
Phase out period     5 years          
Phase out annual percent     20.00%          
Phase out annual amount     $ 13,000,000          
Senior Notes | Fixed-to-Floating Rate Senior Notes due 2028                
Restructuring Cost and Reserve [Line Items]                
Debt face amount               $ 5,000,000
Interest rate on notes (as a percent)               5.00%
Senior Notes | Fixed-to-Floating Rate Subordinated Notes due 2028                
Restructuring Cost and Reserve [Line Items]                
Debt face amount               $ 65,000,000
Interest rate on notes (as a percent)               6.75%
Principal redemption         $ 25,000,000 $ 40,000,000    
Senior Notes | Subordinated Notes due 2029 | Level One                
Restructuring Cost and Reserve [Line Items]                
Phase out period   5 years            
Assumed debt $ 30,000,000