Fair Value Measurement (Details 4) (Fair value nonrecurring basis [Member], USD $) In Thousands, unless otherwise specified											3 Months Ended										3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Impaired originated & PNCI loans [Member]	Mar. 31, 2012 Impaired originated & PNCI loans [Member]	Mar. 31, 2013 Foreclosed assets [Member]	Mar. 31, 2012 Foreclosed assets [Member]	Mar. 31, 2013 Level 3 [Member]	Mar. 31, 2012 Level 3 [Member]	Mar. 31, 2013 Level 3 [Member] Impaired originated & PNCI loans [Member]	Mar. 31, 2012 Level 3 [Member] Impaired originated & PNCI loans [Member]	Mar. 31, 2013 Level 3 [Member] Impaired originated & PNCI loans [Member] Sales comparison approach [Member]	Mar. 31, 2013 Level 3 [Member] Impaired originated & PNCI loans [Member] Income approach [Member]	Mar. 31, 2013 Level 3 [Member] Impaired originated & PNCI loans [Member] Minimum [Member] Sales comparison approach [Member]	Mar. 31, 2013 Level 3 [Member] Impaired originated & PNCI loans [Member] Minimum [Member] Income approach [Member]	Mar. 31, 2013 Level 3 [Member] Impaired originated & PNCI loans [Member] Maximum [Member] Sales comparison approach [Member]	Mar. 31, 2013 Level 3 [Member] Impaired originated & PNCI loans [Member] Maximum [Member] Income approach [Member]	Mar. 31, 2013 Level 3 [Member] Impaired originated & PNCI loans [Member] Weighted Average [Member] Sales comparison approach [Member]	Mar. 31, 2013 Level 3 [Member] Impaired originated & PNCI loans [Member] Weighted Average [Member] Income approach [Member]	Mar. 31, 2013 Level 3 [Member] Foreclosed assets [Member]	Mar. 31, 2012 Level 3 [Member] Foreclosed assets [Member]	Mar. 31, 2013 Level 3 [Member] Foreclosed assets [Member] Sales comparison approach [Member]	Mar. 31, 2013 Level 3 [Member] Foreclosed assets [Member] Minimum [Member] Sales comparison approach [Member]	Mar. 31, 2013 Level 3 [Member] Foreclosed assets [Member] Maximum [Member] Sales comparison approach [Member]	Mar. 31, 2013 Level 3 [Member] Foreclosed assets [Member] Weighted Average [Member] Sales comparison approach [Member]
Quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis
Fair Value	$ 24,341	$ 21,790	$ 23,989	$ 21,110	$ 352	$ 680	$ 24,341	$ 21,790	$ 23,989	$ 21,110									$ 352	$ 680
Valuation Techniques											Sales comparison approach	Income approach									Sales comparison approach
Adjustment for differences between comparable sales													0.00%		41.20%		12.80%					7.50%	7.50%	7.50%
Capitalization rate														6.70%		9.50%		9.10%