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
	Mar. 31, 2013
Mortgage loans held-for-sale, at lower of cost or market	$ 380,900
Fair Value Losses Recognized, Impaired loans—collateral based	5,372
Fair Value Losses Recognized, Other real estate owned	2,959	[1]
Fair Value Losses Recognized, Mortgage loans held-for-sale, at lower of cost or market	0
Fair Value Losses Recognized, Total	8,331
Fair Value, Measurements, Nonrecurring [Member]
Impaired loans - collateral based	121,200
Total	187,726
Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Impaired loans - collateral based	0
Other real estate owned	0
Total	0
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Impaired loans - collateral based	0
Other real estate owned	0
Total	10,352
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Impaired loans - collateral based	121,197
Other real estate owned	56,177
Total	177,374
Assets Held-for-sale [Member] | Fair Value, Measurements, Nonrecurring [Member]
Mortgage loans held-for-sale, at lower of cost or market	10,352
Assets Held-for-sale [Member] | Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Mortgage loans held-for-sale, at lower of cost or market	0
Assets Held-for-sale [Member] | Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Mortgage loans held-for-sale, at lower of cost or market	10,352
Assets Held-for-sale [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Mortgage loans held-for-sale, at lower of cost or market	$ 0

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