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LOAN SERVICING ACTIVITIES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
LOAN SERVICING ACTIVITIES        
Principal balances outstanding $ 9,244,661 $ 5,622,044    
Bank held borrowers' escrow balances 2,900 3,900    
Fair value of SRAs $ 3,856 $ 1,710 $ 1,459 $ 1,315
Weighted average default rate 1.24 1.30    
Real estate and C&I loans        
LOAN SERVICING ACTIVITIES        
Principal balances outstanding $ 471,900 $ 377,700    
Minimum        
LOAN SERVICING ACTIVITIES        
Discount rates 7.80% 4.00%    
Prepayment speeds 5.00% 5.00%    
Maximum        
LOAN SERVICING ACTIVITIES        
Discount rates 12.00% 17.00%    
Prepayment speeds 38.00% 20.00%