COMMITMENTS AND CONTINGENCIES - Loan and Unfunded Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Unused Commitments to Extend Credit	$ 3,968,309	$ 3,904,732
Loans and Leases Receivable, Net of Deferred Income	10,433,385	10,298,971
Commercial
Other Commitments [Line Items]
Unused Commitments to Extend Credit	1,868,883	1,833,977
Loans and Leases Receivable, Net of Deferred Income	3,449,289	3,410,272
Lease financing
Other Commitments [Line Items]
Unused Commitments to Extend Credit	6,847	6,842
Loans and Leases Receivable, Net of Deferred Income	273,898	236,124
Construction real estate
Other Commitments [Line Items]
Unused Commitments to Extend Credit	704,719	689,015
Loans and Leases Receivable, Net of Deferred Income	525,906	512,050
Commercial real estate - investor
Other Commitments [Line Items]
Unused Commitments to Extend Credit	107,150	107,205
Loans and Leases Receivable, Net of Deferred Income	3,102,445	3,094,064
Commercial real estate-owner
Other Commitments [Line Items]
Unused Commitments to Extend Credit	35,040	48,208
Loans and Leases Receivable, Net of Deferred Income	954,182	958,695
Residential real estate
Other Commitments [Line Items]
Unused Commitments to Extend Credit	76,860	74,089
Loans and Leases Receivable, Net of Deferred Income	1,145,069	1,092,265
Home equity
Other Commitments [Line Items]
Unused Commitments to Extend Credit	929,440	903,459
Loans and Leases Receivable, Net of Deferred Income	724,672	733,791
Installment
Other Commitments [Line Items]
Unused Commitments to Extend Credit	20,791	16,073
Loans and Leases Receivable, Net of Deferred Income	204,372	209,895
Credit card
Other Commitments [Line Items]
Unused Commitments to Extend Credit	218,579	225,864
Loans and Leases Receivable, Net of Deferred Income	$ 53,552	$ 51,815