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MORTGAGE BANKING OPERATIONS - Single Family MSR Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Additions and amortization:        
Amortization $ 1,564 $ 2,112 $ 4,874 $ 8,052
Changes in fair value of MSR assumptions 785 1,989 1,794 16,615
Ending balance 76,470   76,470  
Single family        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance 76,314 76,481 76,617 61,584
Additions and amortization:        
Originations 935 1,453 2,473 7,664
Purchases 0 0 460 0
Amortization (1,564) (2,112) (4,874) (8,052)
Net additions and amortization (629) (659) (1,941) (388)
Changes in fair value of MSR assumptions 785 1,989 1,794 16,615
Ending balance $ 76,470 $ 77,811 $ 76,470 $ 77,811