LOANS - Loan Portfolio Segment Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 11,491,921	$ 11,366,989
Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,868,467	5,104,425
Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,737,327	1,755,235
Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,255,609	988,967
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,529,786	1,474,521
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	53,639	121,419
Commercial real estate: | Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,868,467	5,104,425
Commercial real estate: | Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,737,327	1,755,235
Commercial real estate: | Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,255,609	988,967
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,482,329	9,353,507
Commercial business | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,620,926	1,504,880
Residential real estate: | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,529,786	1,474,521
Residential real estate: | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	53,639	121,419
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	426,167	417,542
Total residential and consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,009,592	$ 2,013,482