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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgage Loans Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 7,451,573	$ 7,251,480
NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases (percent)	9.60%	8.80%
NTM Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 717,600	$ 635,300
NTM Loans | Consumer | Non-performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	4,000
NTM Loans | Consumer | Interest Only
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 706,900	613,300
NTM Loans | Consumer | Interest Only | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loan term (in years)	30 years
Mortgage loan, flexible initial term (in years)	1 year
NTM Loans | Consumer | Interest Only | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loan term (in years)	40 years
Mortgage loan, flexible initial term (in years)	10 years
NTM Loans | Consumer | Green
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 10,200	$ 21,500
Interest only notes balloon payment period	15 years

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