Fair Value of Assets and Liabilities (Schedule Level 3 Assets Measured At Fair Value On A Nonrecurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis	$ 4,256		$ 4,493
Foreclosed Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis	2,661		2,779
(Level 3) Significant Other Unobservable Inputs [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis	4,256		4,493
Valuation Techniques	Appraisal (1)	[1]	Appraisal (1)	[1]
Unobservable Input	Appraisal adjustments (2)	[2]	Appraisal adjustments (2)	[2]
(Level 3) Significant Other Unobservable Inputs [Member] | Foreclosed Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis	$ 2,661		$ 2,779
Valuation Techniques	Appraisal (1), (3)	[1],[3]	Appraisal (1), (3)	[1],[3]
Maximum [Member] | (Level 3) Significant Other Unobservable Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, Range	30.00%
Maximum [Member] | (Level 3) Significant Other Unobservable Inputs [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, Range			30.00%
Minimum [Member] | (Level 3) Significant Other Unobservable Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, Range	20.00%
Minimum [Member] | (Level 3) Significant Other Unobservable Inputs [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, Range			20.00%

[1] Fair value is generally determined through independent appraisals, which generally include various level 3 inputs that are not identifiable.

[2] Appraisals may be adjusted downward by the Corporation's management for qualitative factors such as economic conditions, and estimated liquidation expenses. The range of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.

[3] May include qualitative adjustments by the Corporation's management and estimated liquidation expenses.