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COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE-SHEET ACTIVITIES - NARRATIVE (Details)
$ in Thousands
1 Months Ended
Jun. 30, 2022
USD ($)
claim
Dec. 31, 2015
claim
Jun. 30, 2021
USD ($)
Aug. 10, 2017
claim
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet risk, ratio of commitments to originate loans to commitments to sell 42.30%   48.20%  
Margin deposits available as collateral $ 324,900      
Stock borrowings available as collateral 338,980   $ 619,088  
Available securities used as collateral for securities loaned 474,400   728,988  
Available securities used as collateral for bank loans 186,600      
Available securities used as collateral for OCC margin requirements $ 20,000      
Number of derivative actions filed | claim   2    
Number of derivative actions pending | claim       6
Number of consolidated cases | claim 6      
Payments for Legal Settlements $ 9,500      
Low income housing project partnerships        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Commitments to contribute capital 28,100   $ 15,100  
Loan origination commitments        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet, loan origination commitment 3,504,300      
Loan origination commitments | Sales commitment        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet, commitment 8,400      
Loan origination commitments | Fixed Interest Rate        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet, loan origination commitment $ 184,500      
Weighted average fixed interest rate on commitments to extend credit 5.75%   1.94%  
Loan origination commitments | Fixed Interest Rate | Sales commitment        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet, commitment     $ 55,900  
Loan origination commitments | Variable Interest Rate        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet, loan origination commitment $ 3,319,800      
Loan purchase and origination commitments        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet, commitment     708,600  
Loan purchase and origination commitments | Fixed Interest Rate        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet, loan origination commitment     55,000  
Loan purchase and origination commitments | Variable Interest Rate        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet, loan origination commitment     $ 653,500