COMMITMENTS AND CONTINGENCIES - Loan and Unfunded Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Other Commitments [Line Items]
Unused Commitments to Extend Credit	$ 3,894,659	$ 3,750,657
Gross loans and leases, excluding accrued interest	11,786,196	11,761,778
Commercial
Other Commitments [Line Items]
Unused Commitments to Extend Credit	1,863,402	1,887,965
Gross loans and leases, excluding accrued interest	3,927,771	3,815,858
Lease financing
Other Commitments [Line Items]
Unused Commitments to Extend Credit	0	0
Gross loans and leases, excluding accrued interest	587,176	598,045
Construction real estate
Other Commitments [Line Items]
Unused Commitments to Extend Credit	449,305	327,743
Gross loans and leases, excluding accrued interest	732,777	779,446
Commercial real estate - investor
Other Commitments [Line Items]
Unused Commitments to Extend Credit	151,416	95,810
Gross loans and leases, excluding accrued interest	3,007,239	3,093,384
Commercial real estate-owner
Other Commitments [Line Items]
Unused Commitments to Extend Credit	40,816	40,791
Gross loans and leases, excluding accrued interest	954,274	968,360
Residential real estate
Other Commitments [Line Items]
Unused Commitments to Extend Credit	0	76,401
Gross loans and leases, excluding accrued interest	1,492,688	1,462,284
Home equity
Other Commitments [Line Items]
Unused Commitments to Extend Credit	1,044,914	1,002,965
Gross loans and leases, excluding accrued interest	903,299	849,039
Installment
Other Commitments [Line Items]
Unused Commitments to Extend Credit	27,215	33,200
Gross loans and leases, excluding accrued interest	116,598	133,051
Credit card
Other Commitments [Line Items]
Unused Commitments to Extend Credit	317,591	285,782
Gross loans and leases, excluding accrued interest	$ 64,374	$ 62,311