Loans and Leases - Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable
Loan to value ratio	75.00%
Accrued interest	$ 65,900		$ 65,700
Net deferred loan origination fees	36,400		36,800
Net discount	88,300		89,300
Deposit liabilities reclassified as loans receivable	5,500		7,700
Loans with carrying value pledged to secure public deposits and other borrowings	8,700,000		8,600,000
Non-US
Accounts, Notes, Loans and Financing Receivable
Covered loans acquired	181,000		182,400
Acquired Loans
Accounts, Notes, Loans and Financing Receivable
Net discount	$ 53,700		$ 56,400
Consumer and other loans
Accounts, Notes, Loans and Financing Receivable
Loan to value ratio	70.00%
TDRs Occurring during the Period | TDRs
Accounts, Notes, Loans and Financing Receivable
TDRs during period	$ 9,795	$ 31,429
TDRs during period on accrual status	6,800	16,500
TDRs during period on non-accrual status	$ 3,000	$ 14,900