Investment Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Schedule of Investments [Line Items]
Unrealized Loss	$ 595		$ 286
Unrealized Loss	25,356		27,070
Other-than-temporary-impairment loss on securities	0		19
FHLB advances secured by investment securities	5,370
Available-for-sale Securities Pledged as Collateral	157		147
US Government Agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	U.S. Government Agencies - Three U.S. government agencies have been in a slight unrealized loss position for less than 12 months as of December 31, 2012. These securities are of the highest investment grade and the Corporation does not intend to sell them, and it is not more likely than not that the Corporation will be required to sell them before recovery of their amortized cost basis, which may be at maturity. Therefore, no OTTI existed at December 31, 2012. There were no agency securities for which the cost has been less than market value for a period longer than 12 months.
Unrealized Loss	111		17
Unrealized Loss	0		0
Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Residential Mortgage-Backed Agencies - Five residential mortgage-backed agencies have been in an unrealized loss position for less than 12 months as of December 31, 2012. All of these securities are of the highest investment grade and the Corporation does not intend to sell them, nor is it more likely than not that the Corporation will be required to sell them before recovery of their amortized cost basis, which may be at maturity. Therefore, no OTTI existed at December 31, 2012.
Unrealized Loss	191		136
Unrealized Loss	0		1
Commercial mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Unrealized Loss	0		51
Unrealized Loss	0		0
Collateralized mortgage obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Collateralized Mortgage Obligations – One collateralized mortgage obligation security at December 31, 2012 has been in an unrealized loss position for 12 months or more. Four collateralized mortgage obligation securities have been in a slight unrealized loss position for less than 12 months as of December 31, 2012. The Corporation does not intend to sell these securities and it is not more likely than not that the Corporation will be required to sell them before recovery of their amortized cost basis, which may be at maturity. Accordingly, management does not consider these investments to be other-than-temporarily impaired at December 31, 2012.
Unrealized Loss	293		82
Unrealized Loss	0	[1]	123
Taxable municipal bonds and notes [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Obligations of State and Political Subdivisions – The Corporation owns two tax increment fund bonds in the held to maturity portfolio. One of these bonds has been in an unrealized loss position for less than 12 months. This bond is not rated by the rating agencies and was underwritten by the Corporation prior to purchase and is periodically reviewed for credit quality. Therefore, management does not consider this investment to be other-than-temporarily impaired at December 31, 2012.
Unrealized Loss	0		0
Unrealized Loss	0		8
Collateralized debt obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Collateralized Debt Obligations - The $25.4 million in unrealized losses greater than 12 months at December 31, 2012 relates to 18 pooled trust preferred securities that comprise the CDO portfolio. See Note 24 for a discussion of the methodology used by management to determine the fair values of these securities. The Corporation recorded $19 thousand in credit-related non cash OTTI for the year ended 2011 and did not record any credit-related non-cash OTTI charges for the year ended December 31, 2012. The unrealized losses on the remaining securities in the portfolio are primarily attributable to continued depression in market interest rates, marketability, liquidity and the current economic environment.
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	18
Unrealized Loss	0		0
Unrealized Loss	$ 25,356		$ 26,938
Less Than 12 Months [Member] | US Government Agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	3
Less Than 12 Months [Member] | Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	5
Less Than 12 Months [Member] | Taxable municipal bonds and notes [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1
12 Months or More [Member] | US Government Agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	0
12 Months or More [Member] | Collateralized mortgage obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1
12 Months or More [Member] | Collateralized debt obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	18

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