LOANS - Loan Portfolio Segment Balances (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 11,369,639	$ 11,396,706
Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,131,210	5,130,094
Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,770,135	1,775,037
Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,045,742	1,090,028
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,385,743	1,287,933
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	190,690	224,772
Commercial real estate: | Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,131,210	5,130,094
Commercial real estate: | Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,770,135	1,775,037
Commercial real estate: | Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,045,742	1,090,028
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,370,701	9,451,044
Commercial business | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,423,614	1,455,885
Residential real estate: | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,385,743	1,287,933
Residential real estate: | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	190,690	224,772
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	422,505	432,957
Total residential and consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,998,938	$ 1,945,662