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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgage Performance by Credit Score (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 7,251,480	$ 5,898,405
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,251,480
Consumer | Loans And Finance Receivables, Non-Traditional Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	635,300	437,100
Consumer | Loans And Finance Receivables, Non-Traditional Mortgages | First lien
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	633,700
Consumer | Loans And Finance Receivables, Non-Traditional Mortgages | Green
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	21,500	$ 33,200
Consumer | Loans And Finance Receivables, Non-Traditional Mortgages | Green | First lien | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	19,900
Consumer | Loans And Finance Receivables, Non-Traditional Mortgages | Green | First lien | 700 of greater | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 14,100
Percentage to total loans and leases (percent)	71.00%

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