COMMITMENTS AND CONTINGENCIES - Loan and Unfunded Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Other Commitments [Line Items]
Unused Commitments to Extend Credit	$ 3,953,058	$ 3,982,599
Loans and Leases Receivable, Net of Deferred Income	11,205,120	10,933,176
Commercial
Other Commitments [Line Items]
Unused Commitments to Extend Credit	1,968,264	1,942,868
Loans and Leases Receivable, Net of Deferred Income	3,591,428	3,501,221
Lease financing
Other Commitments [Line Items]
Unused Commitments to Extend Credit	0	0
Loans and Leases Receivable, Net of Deferred Income	492,862	474,817
Construction real estate
Other Commitments [Line Items]
Unused Commitments to Extend Credit	502,057	565,009
Loans and Leases Receivable, Net of Deferred Income	641,596	564,832
Commercial real estate - investor
Other Commitments [Line Items]
Unused Commitments to Extend Credit	105,911	101,689
Loans and Leases Receivable, Net of Deferred Income	3,200,152	3,138,629
Commercial real estate-owner
Other Commitments [Line Items]
Unused Commitments to Extend Credit	37,367	40,346
Loans and Leases Receivable, Net of Deferred Income	945,817	942,310
Residential real estate
Other Commitments [Line Items]
Unused Commitments to Extend Credit	79,238	98,686
Loans and Leases Receivable, Net of Deferred Income	1,344,677	1,333,674
Home equity
Other Commitments [Line Items]
Unused Commitments to Extend Credit	985,993	972,474
Loans and Leases Receivable, Net of Deferred Income	773,811	758,676
Installment
Other Commitments [Line Items]
Unused Commitments to Extend Credit	29,905	25,841
Loans and Leases Receivable, Net of Deferred Income	153,838	159,078
Credit card
Other Commitments [Line Items]
Unused Commitments to Extend Credit	244,323	235,686
Loans and Leases Receivable, Net of Deferred Income	$ 60,939	$ 59,939