LOANS - Loan Portfolio Segment Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 11,218,813	$ 9,967,091
Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,066,843	4,141,346
Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,743,724	1,690,881
Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,143,783	1,088,094
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,218,552	937,570
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	229,243	197,652
Commercial real estate: | Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,066,843	4,141,346
Commercial real estate: | Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,743,724	1,690,881
Commercial real estate: | Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,143,783	1,088,094
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,347,984	8,402,155
Commercial business | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,393,634	1,481,834
Residential real estate: | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,218,552	937,570
Residential real estate: | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	229,243	197,652
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	423,034	429,714
Total residential and consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,870,829	$ 1,564,936