LOANS AND LEASES - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) Contract Loan	Mar. 31, 2021 Contract	Dec. 31, 2021 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items]
Loan receivable, validate risk ratings performed for large sample or new lending to existing relationships	$ 1,000,000
Loan receivable, validate risk ratings performed for criticized and classified rated borrowers with relationship exposure, value	500,000
Loan receivable, validate risk ratings performed for new regulation "O" loan commitments, value	1,000,000
Loan receivable validate risk ratings performed for leveraged loans, value	1,000,000
Loan receivable validate risk ratings performed for no borrower with commitments, value	500,000
Loan modifications	947,000,000.0
Troubled debt restructurings specific reserves	$ 2,500,000		$ 0
Number of Loans	1	0
Deferral [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Bank modified loans and contracts | Contract	542
Number of Loans | Loan	4
Substandard [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing receivable individually evaluated loan	$ 15,900,000		$ 15,700,000
Minimum [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loan receivable, validate risk ratings performed for large sample of borrowers with relationship, value	1,000,000
Maximum [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loan receivable, validate risk ratings performed for small sample of borrowers with relationship, value	$ 1,000,000