Loans and Allowance for Credit Losses - Summary of Amortized Cost of Nonaccrual Loans with No Related Allowance (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	$ 110,356	$ 92,300
Amortized Cost of Nonaccrual Loans with no related Allowance	100,989	85,948
Commercial and Industrial Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	91,053	82,845
Amortized Cost of Nonaccrual Loans with no related Allowance	81,686	76,493
Specialty Lending Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	11,797
Amortized Cost of Nonaccrual Loans with no related Allowance	11,797
Commercial Real Estate Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	2,651	4,688
Amortized Cost of Nonaccrual Loans with no related Allowance	2,651	4,688
Consumer Real Estate Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	3,892	4,210
Amortized Cost of Nonaccrual Loans with no related Allowance	3,892	4,210
Consumer Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	572	75
Amortized Cost of Nonaccrual Loans with no related Allowance	572	75
Credit Cards Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	366	457
Amortized Cost of Nonaccrual Loans with no related Allowance	366	457
Leases and Other Portfolio [Member]
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans	25	25
Amortized Cost of Nonaccrual Loans with no related Allowance	$ 25	$ 25