Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Not covered under loss share agreements in other real estate owned	$ 44,828	[1]	$ 43,513	[2]	$ 48,092	[1]
Fair Value, Measurements, Nonrecurring | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	65,164		65,244		45,146
Impaired loans not covered by loss share agreements	39,937		51,644		82,882
Not covered under loss share agreements in other real estate owned	1,970		21,113		8,048
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0		0		0
Impaired loans not covered by loss share agreements	0		0		0
Not covered under loss share agreements in other real estate owned	0		0		0
Fair Value, Measurements, Nonrecurring | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	65,164		65,244		45,146
Impaired loans not covered by loss share agreements	0		0		0
Not covered under loss share agreements in other real estate owned	0		0		0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0		0		0
Impaired loans not covered by loss share agreements	39,937		51,644		82,882
Not covered under loss share agreements in other real estate owned	$ 1,970		$ 21,113		$ 8,048

[1] Unaudited

[2] Derived from 2012 Annual Report on Form 10-K.