Fair Value Accounting and Measurement (Quantitative Information About Level 3 Fair Value Measurements) (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified					3 Months Ended														3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2011 Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2012 Market Approach Valuation Technique [Member] Impaired Loans [Member] Minimum [Member] Fair Value, Inputs, Level 3 [Member]		Mar. 31, 2012 Market Approach Valuation Technique [Member] Impaired Loans [Member] Maximum [Member] Fair Value, Inputs, Level 3 [Member]		Mar. 31, 2012 Market Approach Valuation Technique [Member] Impaired Loans [Member] Weighted Average [Member] Fair Value, Inputs, Level 3 [Member]		Mar. 31, 2012 Noncovered Loans [Member]	Mar. 31, 2011 Noncovered Loans [Member]	Mar. 31, 2012 Noncovered Loans [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2011 Noncovered Loans [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2012 Covered Loans [Member]	Mar. 31, 2011 Covered Loans [Member]	Mar. 31, 2012 Covered Loans [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2011 Covered Loans [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2012 Covered Loans [Member] Market Approach Valuation Technique [Member] Other Real Estate Owned [Member] Minimum [Member] Fair Value, Inputs, Level 3 [Member]		Mar. 31, 2012 Covered Loans [Member] Market Approach Valuation Technique [Member] Other Real Estate Owned [Member] Maximum [Member] Fair Value, Inputs, Level 3 [Member]		Mar. 31, 2012 Covered Loans [Member] Market Approach Valuation Technique [Member] Other Real Estate Owned [Member] Weighted Average [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 12,416	$ 31,712	$ 12,416	$ 31,712
OREO											3,510	4,490	3,510	4,490	1,917	31	1,917	31
OPPO											$ 2,334	$ 2,420	$ 2,334	$ 2,420
Fair Value Inputs, Comparability Adjustments					0.00%	[1]	37.00%	[1]	12.00%	[1]									0.00%	[1]	23.00%	[1]	3.00%	[1]

[1] Discount recorded to appraisal value.