Fair Values Of Assets And Liabilities (Summary Of Assets Measured At Fair Value On A Nonrecurring Basis) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012		Sep. 30, 2012
Mortgage loans held-for-sale, at lower of cost or market	$ 570,000		$ 570,000
Impaired loans, Fair Value Losses (Gains) Recognized	6,187		19,049
Other real estate owned, Fair Value Losses Recognized	4,484	[1]	18,936	[1]
Loans Held For Sale Fair Value Of Losses Recognized	0		0
Fair Value Losses Recognized	10,671		37,985
Fair Value, Measurements, Nonrecurring [Member]
Other real estate owned	67,400		67,400
Fair value of assets measured on nonrecurring basis	237,041		237,041
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Impaired loans - collateral based	0		0
Other real estate owned	0		0
Fair value of assets measured on nonrecurring basis	0		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Impaired loans - collateral based	0		0
Other real estate owned	0		0
Fair value of assets measured on nonrecurring basis	21,685		21,685
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Impaired loans - collateral based	147,979		147,979
Other real estate owned	67,377		67,377
Fair value of assets measured on nonrecurring basis	215,356		215,356
Assets Held-for-sale [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets, Fair Value Disclosure	21,685		21,685
Assets Held-for-sale [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Mortgage loans held-for-sale, at lower of cost or market	0		0
Assets Held-for-sale [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Mortgage loans held-for-sale, at lower of cost or market	21,685		21,685
Assets Held-for-sale [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Mortgage loans held-for-sale, at lower of cost or market	0		0
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets, Fair Value Disclosure	$ 67,377		$ 67,377

[1] Fair value losses recognized on other real estate owned include valuation adjustments and charge-offs during the respective period.