LOANS AND LEASES - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) loans	Mar. 31, 2020 USD ($) loans	Dec. 31, 2020 USD ($) loans	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	22	21
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 0	$ 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans	0	0
Restructured Loans, Portion Determined to be Uncollectible	$ 30,000	$ 400,000
Restructured Loans, Nonaccrual Status	20,900,000		$ 14,700,000
Real Estate Acquired Through Foreclosure	854,000	$ 1,467,000	1,287,000	$ 2,033,000
Troubled Debt Restructuring	32,500,000		21,800,000
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Amount	$ 251,100,000		320,200,000
Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Commercial segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	4	2
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum	$ 250,000
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	10	14
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum	$ 250,000
Commercial segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unearned fees	21,900,000		13,700,000
Paycheck Protection Program Amount of Funding	690,000,000.0		594,600,000
Payment Deferral [Member] | Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Amount	$ 153,000,000.0		$ 186,200,000
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Percent	60.90%		58.20%
Payment Deferral [Member] | Franchise
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Amount	$ 44,100,000		$ 44,300,000
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Percent	17.60%		13.80%
Payment Deferral [Member] | Interest only payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Amount	$ 225,800,000		$ 291,500,000
Payment Deferral [Member] | Full principal and Interest payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Amount	$ 25,300,000		$ 28,700,000
Payment Deferral [Member] | Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	25		53
Troubled Debt Restructuring	$ 2,700,000		$ 7,700,000
Payment Deferral [Member] | Commercial segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	67		90
Troubled Debt Restructuring	$ 248,400,000		$ 312,500,000