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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgages Portfolio (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 7,451,573	$ 7,251,480
Consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	717,600	635,300
Consumer | NTM Loans | Green
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	10,200	$ 21,500
Consumer | NTM Loans | First Mortgage | Debt-to-Value Ratio, Less than 80 Percent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	717,600
Consumer | NTM Loans | First Mortgage | Green | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	10,200
Consumer | NTM Loans | First Mortgage | Green | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio | FICO Score, Greater than 700
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 6,400
Percentage to total loans and leases (percent)	63.00%

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