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Investments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Schedule of Investments [Line Items]    
Unrealized Loss $ (9,044) $ (595)
Unrealized Loss (22,188) (25,356)
US government agencies [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature U.S. Government Agencies - Thirteen U.S. government agencies have been in an unrealized loss position for less than 12 months as of June 30, 2013. There were no U.S. government agencies in an unrealized loss position for 12 months or more. The 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. Accordingly, management does not consider these investments to be other-than-temporarily impaired at June 30, 2013.  
Unrealized Loss (3,577) (111)
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 - Twenty-two residential mortgage-backed agencies have been in an unrealized loss position for less than 12 months as of June 30, 2013. There were no residential mortgage-backed agency securities in an unrealized loss position for 12 months or more. The 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 the securities 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 June 30, 2013.Commercial Mortgage-Backed Agencies - Ten commercial mortgage-backed agencies have been in an unrealized loss position for less than 12 months as of June 30, 2013. There were no commercial mortgage-backed agency securities in an unrealized loss position for 12 months or more. The 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 the securities 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 June 30, 2013.  
Unrealized Loss (3,741) (191)
Unrealized Loss 0 0
Commercial mortgage-backed agencies [Member]
    
Schedule of Investments [Line Items]    
Unrealized Loss (675) 0
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 June 30, 2013 was in an unrealized loss position for 12 months or more. There were two collateralized mortgage obligation securities in an unrealized loss position for less than 12 months. The 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 the securities before recovery of their amortized cost basis. Accordingly, management does not consider these investments to be other-than-temporarily impaired at June 30, 2013.  
Unrealized Loss (238) (293)
Unrealized Loss (22) 0 [1]
Obligations of states and political subdivisions [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature Obligations of State and Political Subdivisions - Seven securities have been in an unrealized loss position for less than 12 months. There are no securities that have been in an unrealized loss position for 12 months or more. These investments are of investment grade as determined by the major rating agencies and management reviews the ratings of the underlying issuers. Management believes that this portfolio is well-diversified throughout the United States, and all bonds continue to perform according to their contractual terms. The Corporation does not intend to sell these investments and it is not more likely than not that the Corporation will be required to sell the investments 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 June 30, 2013.  
Unrealized Loss (813) 0
Unrealized Loss 0 0
Collateralized debt obligations [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature Collateralized Debt Obligations - The $22.2 million in unrealized losses greater than 12 months at June 30, 2013 relates to 17 pooled trust preferred securities that are included in the CDO portfolio. See Note 8 for a discussion of the methodology used by management to determine the fair values of these securities. Based upon a review of credit quality and the cash flow tests performed by the independent third party, management determined that there were no securities that had credit-related non-cash OTTI charges during the first six months of 2013. 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.  
Unrealized Loss 0 0
Unrealized Loss $ (22,166) $ (25,356)
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 13  
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 22  
Less Than 12 Months [Member] | Collateralized mortgage obligations [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 0  
Less Than 12 Months [Member] | Obligations of states and political subdivisions [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 7  
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] | Residential mortgage-backed 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] | Obligations of states and political subdivisions [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 debt obligations [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 17  
[1] * - De minimis