LOANS - Loan Portfolio Segment Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 11,364,284	$ 11,366,989
Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,997,879	5,104,425
Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,741,113	1,755,235
Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,090,259	988,967
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,511,624	1,474,521
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	97,685	121,419
Commercial real estate: | Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,997,879	5,104,425
Commercial real estate: | Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,741,113	1,755,235
Commercial real estate: | Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,090,259	988,967
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,338,843	9,353,507
Commercial business | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,509,592	1,504,880
Residential real estate: | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,511,624	1,474,521
Residential real estate: | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	97,685	121,419
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	416,132	417,542
Total residential and consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,025,441	$ 2,013,482