LOANS - Loan Portfolio Segment Balances (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 10,144,328	$ 9,967,091
Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,388,275	4,141,346
Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,692,253	1,690,881
Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,089,331	1,088,094
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,000,697	937,570
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	204,259	197,652
Commercial real estate: | Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,388,275	4,141,346
Commercial real estate: | Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,692,253	1,690,881
Commercial real estate: | Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,089,331	1,088,094
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,519,461	8,402,155
Commercial | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,349,602	1,481,834
Residential real estate: | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,000,697	937,570
Residential real estate: | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	204,259	197,652
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	419,911	429,714
Total residential and consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,624,867	$ 1,564,936