Investments (Narrative) (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($) security	Dec. 31, 2014 USD ($)
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 583	$ 108
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	9,278	13,864
Held-to-maturity securities	107,816	109,449
Held-to-maturity gross unrealized losses	$ 294	122
U.S. Treasury [Member]
Schedule of Investments [Line Items]
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, nature	U.S. Treasuries – Available for Sale – As of June 30, 2015, there were no securities issued by the U.S. Treasury that were in a loss position.
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 0	11
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 0	0
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 three U.S. government agencies in an unrealized loss position for less than 12 months as of June 30, 2015. There was one U.S. government agency in an unrealized loss position for 12 months or more. The security is of the highest investment grade and the Corporation does not intend to sell it, and it is not more likely than not that the Corporation will be required to sell it before recovery of its amortized cost basis, which may be at maturity. Accordingly, management does not consider this investment to be other-than-temporarily impaired at June 30, 2015.
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | security	3
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security	1
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 102	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 41	253
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	U.S. Government Agencies – Held to Maturity – There was one security issued by government agencies in an unrealized loss position for less than 12 months as of June 30, 2015. 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 June 30, 2015. There were no securities issued by government agencies in an unrealized loss position for 12 months or more.
Held-to-maturity securities	$ 24,611	24,520
Held-to-maturity gross unrealized losses	$ 33	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 for less than 12 months as of June 30, 2015. There was one residential mortgage-backed agency security in an unrealized loss position for 12 months or more. The security is of the highest investment grade and the Corporation does not intend to sell it, and it is not more likely than not that the Corporation will be required to sell the security before recovery of its amortized cost basis, which may be at maturity. Accordingly, management does not consider this investment to be other-than-temporarily impaired at June 30, 2015
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | security	0
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security	1
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 268	412
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Residential Mortgage-Backed Agencies – Held to Maturity - Twelve residential mortgage-backed agencies have been in an unrealized loss position for less than 12 months as of June 30, 2015. 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 June 30, 2015. There were no residential mortgage-backed agencies in an unrealized loss position for 12 months or more.
Held-to-maturity securities	$ 55,616	58,400
Held-to-maturity gross unrealized losses	$ 121	5
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 five commercial mortgage-backed agencies in an unrealized loss position for less than 12 months as of June 30, 2015. 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, 2015. 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 | security	5
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security	0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 100	97
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 0	6
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 the Held to Maturity portfolio as of June 30, 2015 in a loss position.
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security	0
Held-to-maturity securities	$ 18,215	16,425
Held-to-maturity gross unrealized losses	$ 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 – Available for Sale – There was one collateralized mortgage obligations in an unrealized loss position for less than 12 months as of June 30, 2015. The security is of the highest investment grade and the Corporation does not intend to sell it, and it is not more likely than not that the Corporation will be required to sell it 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, 2015. 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, greater than or equal to one year | security	0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 91
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 0
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Collateralized Mortgage Obligations – Held to Maturity – There was one collateralized mortgage obligations in an unrealized loss position for less than 12 months as of June 30, 2015. 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 June 30, 2015. There were no collateralized mortgage obligations in an unrealized loss position for 12 months or more.
Held-to-maturity securities	$ 6,749	7,379
Held-to-maturity gross unrealized losses	$ 140	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 ten obligations of state and political subdivisions that have been in an unrealized loss position for less than 12 months at June 30, 2015. There was one security that had 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 June 30, 2015.
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | security	10
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security	1
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 290	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 154	260
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Obligations of State and Political Subdivisions – Held to Maturity – There were no obligations of state and political subdivisions in the Held to Maturity portfolio as of June 30, 2015 in a loss position.
Held-to-maturity securities	$ 2,625	2,725
Held-to-maturity gross unrealized losses	$ 0	117
Collateralized debt obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, nature	Collateralized Debt Obligations – Available for Sale - The $8.8 million in unrealized losses greater than 12 months at June 30, 2015 relates to 13 pooled trust preferred securities that are included in the CDO portfolio. See Note 9 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 2015. 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, less than one year | security	1
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security	13
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 8,815	$ 12,933
Less Than 12 Months [Member] | Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security	12
Less Than 12 Months [Member] | Obligations of states and political subdivisions [Member]
Schedule of Investments [Line Items]
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security	0
12 Months or More [Member] | Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security	0