LOANS AND LEASES - Additional Information (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2022 USD ($) loans	Mar. 31, 2022 loans	Sep. 30, 2021 USD ($) loans	Sep. 30, 2022 USD ($) loans	Sep. 30, 2021 USD ($) loans	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	6		3	20	30
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 200,000		$ 100,000	$ 200,000	$ 100,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans	2		1	2	1
Restructured Loans, Portion Determined to be Uncollectible	$ 0		$ 600,000	$ 3,200,000	$ 600,000
Restructured Loans, Nonaccrual Status	12,800,000			12,800,000			$ 16,000,000
Real Estate Acquired Through Foreclosure	22,000		$ 340,000	22,000	$ 340,000	$ 22,000	98,000	$ 340,000	$ 1,287,000
Troubled Debt Restructuring	23,800,000			23,800,000			27,600,000
Financing Receivable, Non-Troubled Debt Restructuring Modifications, Amount	0			0			16,500,000
Loans and Leases Receivable, Net of Deferred Income	$ 9,797,436,000			$ 9,797,436,000			9,288,299,000
Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0		1	0	1
Commercial segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0		0	6	5
Loans and Leases Receivable, Net of Deferred Income	$ 8,719,000			$ 8,719,000			17,362,000
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	5		1	11	14
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum				$ 250,000
Loans and Leases Receivable, Net of Deferred Income	$ 10,250,000			10,250,000			8,305,000
Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	199,000			199,000			203,000
Lease financing | Summit Funding Group, Inc.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income							41,900,000
Commercial segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unearned fees	200,000			200,000			2,600,000
Paycheck Protection Program Amount of Funding	3,900,000			3,900,000			55,600,000
Loans and Leases Receivable, Net of Deferred Income	$ 3,139,219,000			$ 3,139,219,000			$ 2,720,028,000
Payment Deferral [Member] | Commercial segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		2