LOANS - Loan Portfolio Segment Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 9,967,091	$ 10,400,509
Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,141,346	3,634,720
Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,690,881	1,642,216
Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,088,094	1,050,973
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	937,570	1,105,179
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	197,652	182,619
Commercial real estate: | Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,141,346	3,634,720
Commercial real estate: | Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,690,881	1,642,216
Commercial real estate: | Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,088,094	1,050,973
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,402,155	8,595,457
Commercial | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,481,834	2,267,548
Residential real estate: | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	937,570	1,105,179
Residential real estate: | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	197,652	182,619
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	429,714	517,254
Total residential and consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,564,936	$ 1,805,052