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MORTGAGE BANKING OPERATIONS - Single Family MSR Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Additions and amortization:        
Amortization $ 5,181 $ 4,351 $ 10,874 $ 7,845
Changes in fair value of MSR assumptions 5,024 2,166 (6,439) 19,010
Ending balance 59,872   59,872  
Single family        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance 62,352 49,933 49,966 68,109
Additions and amortization:        
Originations 7,725 4,211 14,341 6,373
Amortization (5,181) (4,351) (10,874) (7,845)
Net additions and amortization 2,544 (140) 3,467 (1,472)
Changes in fair value of MSR assumptions (5,024) (1,989) 6,439 (18,833)
Ending balance $ 59,872 $ 47,804 $ 59,872 $ 47,804