| **Derivative Financial Instruments (Tables)**                                            | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| **Derivative Instruments and Hedging Activities Disclosure [Abstract]**                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet | The table below presents the fair value of the Corporation’s derivative financial instruments, as well as their classification on the Balance Sheet, as of September 30, 2013, and December 31, 2012.  Asset DerivativesLiability Derivatives September 30, 2013December 31, 2012September 30, 2013December 31, 2012 BalanceSheetLocationFairValueBalanceSheetLocationFairValueBalanceSheetLocationFairValueBalanceSheetLocationFairValueDerivatives designated as hedging instruments:        Interest rate contractsOther Assets$421Other Assets$197Other Liabilities$1,441Other Liabilities$3,332Derivatives not designated as hedging instruments:        Interest rate contractsOther Assets$3,054Other Assets$6,103Other Liabilities$3,136Other Liabilities$6,434                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance    | The tables below present the effect of the Corporation’s derivative financial instruments on the Income Statement for three and nine months ended September 30, 2013, and 2012. Derivatives Not Designated asHedging Instruments underFASB ASC 815-10Location of Gain (Loss)Recognized Income onDerivativeAmount of Gain (Loss)Recognized Income onDerivativeAmount of Gain (Loss)Recognized Income onDerivative  Three Months EndedSeptember 30, 2013Nine Months Ended September 30, 2013Interest rate contractsOther income$(16)$249Derivatives Not Designated asHedging Instruments underFASB ASC 815-10Location of Gain (Loss)Recognized Income onDerivativeAmount of Gain (Loss)Recognized Income onDerivativeAmount of Gain (Loss)Recognized Income onDerivative  Three Months Ended September 30, 2012Nine Months Ended September 30, 2012Interest rate contractsOther income$(70)$(125) The amount of gain (loss) recognized in other comprehensive income is included in the table below for the periods indicated.Derivatives in Cash Flow Hedging RelationshipsAmount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)Three Months ended Nine Months endedSeptember 30, 2013September 30, 2012 September 30, 2013September 30, 2012Interest Rate Products$(248)$(376) $1,550$(1,529)The amount of gain (loss) reclassified from other comprehensive income into income is included in the table below for the periods indicated.Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion)Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion)Three Months ended Nine Months endedSeptember 30, 2013September 30, 2012 September 30, 2013September 30, 2012Interest Expense$(207)  $(587)  |

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| - Definition
Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959
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| - Definition
Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959
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