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MORTGAGE BANKING OPERATIONS - Single Family MSR Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Additions and amortization:    
Amortization $ 3,425 $ 5,693
Changes in fair value of MSR assumptions 10,303 11,463
Ending balance 72,378  
Single family    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance 61,584 49,966
Additions and amortization:    
Originations 3,916 6,616
Amortization (3,425) (5,693)
Net additions and amortization 491 923
Changes in fair value of MSR assumptions 10,303 11,463
Ending balance $ 72,378 $ 62,352