COMMITMENTS AND CONTINGENCIES - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) loan_repurchased	Dec. 31, 2020 USD ($) loan_repurchased	Dec. 31, 2019 USD ($)
Other Commitments [Line Items]
Commitments of lending operations	$ 0	$ 0
Commitments to sell residential mortgages	57,900,000	91,900,000
(Recovery of) provision for credit losses	(117,087,000)	153,180,000	$ 25,560,000
Allowance for credit losses	94,507,000	228,804,000	$ 47,576,000
Unfunded Loan Commitment
Other Commitments [Line Items]
(Recovery of) provision for credit losses	(800,000)	3,700,000
Allowance for credit losses	7,400,000	$ 8,200,000
Secondary Market Loan Sales
Other Commitments [Line Items]
(Recovery of) provision for credit losses	$ 0
Number of loans repurchased | loan_repurchased	0	0
Minimum
Other Commitments [Line Items]
Closing period of residential mortgage commitments	1 month
Maximum
Other Commitments [Line Items]
Closing period of residential mortgage commitments	6 months
Real Estate
Other Commitments [Line Items]
Commitments of lending operations	$ 600,700,000
Commitments to Extend Credit
Other Commitments [Line Items]
Commitments of lending operations	2,500,000,000
Consumer
Other Commitments [Line Items]
Commitments of lending operations	$ 731,900,000