Fair Value Information (Details 1) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Impairment losses	$ (656)	$ (904)
Loss on Impaired Loans Non-covered	(6,707)	(50,482)
Loss on OREO Non-covered	(523)	(1,283)
Loss on OREO-Covered	(2,192)	(1,917)
Non-covered loans held for sale activity [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Loss on Loans held-for-sale		(865)
Covered loans held for sale activity [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Loss on Loans held-for-sale	(250)
Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Investment securities held-to-maturity	2,383	3,143
Impaired Loans - Non-covered	30,014	89,676
OREO-Non-covered	4,866	2,462
OREO-Covered	2,541	2,577
Carrying Amount [Member] | Non-covered loans held for sale activity [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Loans held-for-sale		1,656
Carrying Amount [Member] | Covered loans held for sale activity [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Loans held-for-sale	1,404
Fair Value, Inputs, Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Investment securities held-to-maturity	0	0
Impaired Loans - Non-covered	0	0
OREO-Non-covered	0	0
OREO-Covered	0	0
Fair Value, Inputs, Level 1 [Member] | Non-covered loans held for sale activity [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Loans held-for-sale		0
Fair Value, Inputs, Level 1 [Member] | Covered loans held for sale activity [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Loans held-for-sale	0
Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Investment securities held-to-maturity	0	0
Impaired Loans - Non-covered	0	0
OREO-Non-covered	0	0
OREO-Covered	0	0
Fair Value, Inputs, Level 2 [Member] | Non-covered loans held for sale activity [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Loans held-for-sale		0
Fair Value, Inputs, Level 2 [Member] | Covered loans held for sale activity [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Loans held-for-sale	0
Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Investment securities held-to-maturity	2,383	3,143
Impaired Loans - Non-covered	30,014	89,676
OREO-Non-covered	4,866	2,462
OREO-Covered	2,541	2,577
Fair Value, Inputs, Level 3 [Member] | Non-covered loans held for sale activity [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Loans held-for-sale		1,656
Fair Value, Inputs, Level 3 [Member] | Covered loans held for sale activity [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Loans held-for-sale	$ 1,404