COMMITMENTS AND CONTINGENCIES - Loan and Unfunded Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Other Commitments [Line Items]
Unused Commitments to Extend Credit	$ 3,804,386	$ 3,982,599
Loans and Leases Receivable, Net of Deferred Income	11,521,203	10,933,176
Commercial
Other Commitments [Line Items]
Unused Commitments to Extend Credit	1,819,434	1,942,868
Loans and Leases Receivable, Net of Deferred Income	3,782,487	3,501,221
Lease financing
Other Commitments [Line Items]
Unused Commitments to Extend Credit	0	0
Loans and Leases Receivable, Net of Deferred Income	534,557	474,817
Construction real estate
Other Commitments [Line Items]
Unused Commitments to Extend Credit	463,236	565,009
Loans and Leases Receivable, Net of Deferred Income	741,406	564,832
Commercial real estate - investor
Other Commitments [Line Items]
Unused Commitments to Extend Credit	84,915	101,689
Loans and Leases Receivable, Net of Deferred Income	3,104,711	3,138,629
Commercial real estate-owner
Other Commitments [Line Items]
Unused Commitments to Extend Credit	36,927	40,346
Loans and Leases Receivable, Net of Deferred Income	971,885	942,310
Residential real estate
Other Commitments [Line Items]
Unused Commitments to Extend Credit	77,676	98,686
Loans and Leases Receivable, Net of Deferred Income	1,377,290	1,333,674
Home equity
Other Commitments [Line Items]
Unused Commitments to Extend Credit	1,011,924	972,474
Loans and Leases Receivable, Net of Deferred Income	800,860	758,676
Installment
Other Commitments [Line Items]
Unused Commitments to Extend Credit	29,558	25,841
Loans and Leases Receivable, Net of Deferred Income	148,530	159,078
Credit card
Other Commitments [Line Items]
Unused Commitments to Extend Credit	280,716	235,686
Loans and Leases Receivable, Net of Deferred Income	$ 59,477	$ 59,939