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MORTGAGE BANKING OPERATIONS - Sensitivity Analysis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Key economic assumptions and the sensitivity of the current fair valu for single family MSRs
Single family mortgage servicing rights	$ 61,584
Expected weighted-average life (in years)	5 years 11 months 8 days
Constant Prepayment Rate [Abstract]
Impact on fair value of 25 basis points adverse change in interest rates	$ (3,641)
Impact on fair value of 50 basis points adverse change in interest rates	(7,325)
Discount Rate [Abstract]
Impact on fair value of 100 basis points increase	(2,999)
Impact on fair value of 200 basis points increase	$ (5,770)
CPRs
Key economic assumptions and the sensitivity of the current fair valu for single family MSRs
Measurement input	8.84%	11.37%	18.23%
CPRs \| Minimum
Key economic assumptions and the sensitivity of the current fair valu for single family MSRs
Measurement input	7.90%	8.13%
CPRs \| Maximum
Key economic assumptions and the sensitivity of the current fair valu for single family MSRs
Measurement input	17.35%	19.70%
CPRs \| Weighted Average
Key economic assumptions and the sensitivity of the current fair valu for single family MSRs
Measurement input	10.35%	12.81%
Discount Rates
Key economic assumptions and the sensitivity of the current fair valu for single family MSRs
Measurement input	8.23%	7.82%	9.31%
Discount Rates \| Minimum
Key economic assumptions and the sensitivity of the current fair valu for single family MSRs
Measurement input	6.94%	6.50%
Discount Rates \| Maximum
Key economic assumptions and the sensitivity of the current fair valu for single family MSRs
Measurement input	13.96%	13.14%
Discount Rates \| Weighted Average
Key economic assumptions and the sensitivity of the current fair valu for single family MSRs
Measurement input	7.97%	8.27%