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Investment Securities (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | $ $ 2,063 $ 552
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | $ 7,767 7,415
Available-for-sale securities pledged as collateral | $ $ 121,800 140,000
US government agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature U.S. Government Agencies – Available for Sale – There were four U.S. government agencies in an unrealized loss position for less than 12 months as of December 31, 2016. 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 December 31, 2016.  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 4  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | $ $ 747 129
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | $ $ 0 0
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature U.S. Government Agencies – Held to Maturity – There were no U.S. government agencies in an unrealized loss position as of December 31, 2016.  
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 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 – Available for Sale - There were no residential mortgage-backed agencies in an unrealized loss position as of December 31, 2016.  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | $   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | $   220
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature Residential Mortgage-Backed Agencies – Held to Maturity – There were 15 residential mortgage-backed agencies have been in an unrealized loss position for less than 12 months as of December 31, 2016. The securities are of the highest investment grade and the Corporation has the intent and ability to hold the investments to maturity. Accordingly, management does not consider these investments to be other-than-temporarily impaired at December 31, 2016. There were no residential mortgage-backed agencies in an unrealized loss position for 12 months or more.  
Held To Maturity Securities in unrealized loss positions qualitative disclosure number of positions less than one year 15  
Held to maturity securities in unrealized loss positions qualitative disclosure number of positions greater than or equal to one year 0  
Commercial mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature Commercial Mortgage-Backed Agencies – Available for Sale – There were nine commercial mortgage-backed agencies in an unrealized loss position for less than 12 months as of December 31, 2016. 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 December 31, 2016. There were no commercial mortgage-backed agency securities in an unrealized loss position for 12 months or more.  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 9  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | $ $ 757 196
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | $ $ 0 0
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature Commercial Mortgage-Backed Agencies – Held to Maturity – There were no commercial mortgage-backed agencies in an unrealized loss position as of December 31, 2016  
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 0  
Collateralized mortgage obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature Collateralized Mortgage Obligations – Available for Sale – There were three collateralized mortgage obligations in an unrealized loss position for less than 12 months as of December 31, 2016. 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 the amortized cost basis, which may be at maturity. Accordingly, management does not consider these investments to be other-than-temporarily impaired at December 31, 2016. There were no collateralized mortgage obligations in an unrealized loss position for 12 months or more.  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 3  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | $ $ 399 123
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | $ $ 0 0
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature Collateralized Mortgage Obligations – Held to Maturity – There was one collateralized mortgage obligation in an unrealized loss position for less than 12 months as of December 31, 2016. The security is of the highest investment grade and the Corporation has the intent and ability to hold the investment to maturity. Accordingly, management does not consider this investment to be other-than-temporarily impaired at December 31, 2016. There were no collateralized mortgage obligations in an unrealized loss position for 12 months or more.  
Held To Maturity Securities in unrealized loss positions qualitative disclosure number of positions less than one year 1  
Held to maturity securities in unrealized loss positions qualitative disclosure number of positions greater than or equal to one year 0  
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 – Available for Sale – There were five obligations of state and political subdivisions that have been in an unrealized loss position for less than 12 months at December 31, 2016. There was one security that has 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 and performs an in-depth credit analysis on the securities. 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 December 31, 2016.  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 5  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 1  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | $ $ 160 104
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | $ $ 91 119
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature Obligations of State and Political Subdivisions – Held to Maturity – There was one obligations of state and political subdivision in an unrealized loss position for less than 12 months as of December 31, 2016. This bond is a Tax Increment Fund (TIF) bond. Management performs an in-depth credit analysis on this security. The Corporation has the intent and ability to hold the investment to maturity. Accordingly, management does not consider this investment to be other-than-temporarily impaired at December 31, 2016. There were no obligations of state and political subdivisions in an unrealized loss position for 12 months for more.  
Held To Maturity Securities in unrealized loss positions qualitative disclosure number of positions less than one year 1  
Held to maturity securities in unrealized loss positions qualitative disclosure number of positions greater than or equal to one year 0  
Collateralized debt obligations [Member]    
Schedule of Investments [Line Items]    
Impairment losses | $ $ 3,200  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature Collateralized Debt Obligations – Available for Sale - The $7.7 million in unrealized losses greater than 12 months at December 31, 2016 relates to twelve pooled trust preferred securities that are included in the CDO portfolio. See Note 24 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 2016. 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, Greater than or Equal to One Year 12  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | $ $ 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | $ $ 7,676 $ 7,076