Fair Value Measurements, Level III Valuation (Details) (Impaired Loans [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Roll-forward of the transfers in and out of the Level III valuation method [Roll Forward]
Beginning balance	$ 3,881
Transfers in	2,452
Transfers out	(3,744)	[1]
Other	(517)	[2]
Ending balance	2,072
Level 3 [Member] | Nonrecurring [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets fair value	$ 2,072
Level 3 [Member] | Nonrecurring [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for selling costs and age of appraisals	30.00%
Level 3 [Member] | Nonrecurring [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for selling costs and age of appraisals	10.00%
Level 3 [Member] | Nonrecurring [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for selling costs and age of appraisals	21.00%

[1] Impaired loans are considered to have a Level III valuation methodology if the appraisal on the loan is older than two years. Transfers out of level three status represent loans for which current appraisals have been obtained or loans which have been transferred to other real estate owned and the collateral re-appraised at the time of the transfer.

[2] Other changes in the Level III balances during the period represent principal changes on level three impaired loans and minor valuation adjustments.