Fair Value Measurements (Schedule Of Valuation Methodology And Unobservable Inputs) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended								9 Months Ended				9 Months Ended
	Sep. 30, 2014 Minimum [Member] Prepayment speeds [Member]	Sep. 30, 2014 Minimum [Member] Discount rate [Member]	Sep. 30, 2014 Maximum [Member] Prepayment speeds [Member]	Sep. 30, 2014 Maximum [Member] Discount rate [Member]	Sep. 30, 2014 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Nonrecurring [Member]		Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Nonrecurring [Member]		Sep. 30, 2014 Other Real Estate Owned [Member] Discount for costs to sell [Member]	Sep. 30, 2014 Other Real Estate Owned [Member] Minimum [Member] Discount for appraisal type [Member]	Sep. 30, 2014 Other Real Estate Owned [Member] Maximum [Member] Discount for appraisal type [Member]	Sep. 30, 2014 Other Real Estate Owned [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Nonrecurring [Member]	Sep. 30, 2014 Impaired Loans [Member] Minimum [Member] Discount for date appraisal [Member]	Sep. 30, 2014 Impaired Loans [Member] Minimum [Member] Discount for costs to sell [Member]	Sep. 30, 2014 Impaired Loans [Member] Maximum [Member] Discount for date appraisal [Member]	Sep. 30, 2014 Impaired Loans [Member] Maximum [Member] Discount for costs to sell [Member]	Sep. 30, 2014 Impaired Loans [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements [Line Items]
Impaired loans and leases					$ 13,377,939		$ 12,515,714										$ 40,927
Other real estate owned												831
Mortgage servicing assets					$ 29,213	[1]	$ 29,150	[1]
Range of Inputs	6.80%	1.40%	25.30%	3.70%					8.00%	0.00%	25.00%		2.00%	0.00%	15.00%	8.00%

[1] The carrying amount of mortgage servicing assets is net of $11 thousand and $0.2 million reserves at September 30, 2014 and December 31, 2013, respectively. The estimated fair value does not include such adjustments.