MERGERS AND ACQUISITIONS - Additional Information (Details) $ in Millions			1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2022 USD ($) shares	Jan. 22, 2022 USD ($) shares	Jan. 31, 2022 shares	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Business Acquisition [Line Items]
Merger expenses				$ 2.0	$ 0.0	$ 31.0	$ 0.0
Allowance for credit losses on loans and leases
Business Acquisition [Line Items]
Financing receivable, purchased with credit deterioration, allowance for credit loss at acquisition date						10.0
Howard
Business Acquisition [Line Items]
Assets acquired as a result of merger		$ 2,356.0
Loans and deposits acquired as a result of merger		1,800.0
Value of acquisition		443.0
Number of shares issued (in shares) | shares			34,100,000
Merger expenses						30.2
Financing receivable, purchased with credit deterioration, amount at purchase price		186.9
Financing receivable, purchased with credit deterioration, allowance for credit loss at acquisition date		10.0
Financing receivable, purchased with credit deterioration, discount (premium)		5.4
Financing receivable, purchased with credit deterioration, fair value		171.5
Howard | Allowance for credit losses on loans and leases
Business Acquisition [Line Items]
Financing receivable, non-purchased credit deterioration loans, allowance for credit loss at acquisition date, provision		$ 19.1				$ 19.1
Howard | Common Stock
Business Acquisition [Line Items]
Number of shares issued (in shares) | shares		34,074,495
Common shares to be acquired (in shares) | shares		18,930,329
UB Bancorp
Business Acquisition [Line Items]
Assets acquired as a result of merger	$ 1,200.0
Value of acquisition	$ 119.0
UB Bancorp | Common Stock
Business Acquisition [Line Items]
Number of shares issued (in shares) | shares	9,800,000
Common shares to be acquired (in shares) | shares	6,000,000
Conversion ratio	1.61