Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs	[1]	$ 272,690	$ 318,794
Accruing TDRs performing under modified terms more than one year		55.00%	67.50%
Specific reserves for TDRs included in the balance of allowance for loan and lease losses		$ 21,405	$ 23,785
Additional funds committed to borrowers in TDR status		1,133	552
Interest Receivable		43,100	38,400
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		171,784	241,855
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		100,906	76,939
Troubled Debt Restructures [Member]
Financing Receivable, Modifications [Line Items]
Interest Receivable		$ 1,100	$ 1,400

[1] Total recorded investment of TDRs exclude $1.1 million and $1.4 million at December 31, 2015 and December 31, 2014, respectively, of accrued interest receivable.