| **Derivative Financial Instruments (Tables)**                                            | 6 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 June 30, 2016, and December 31, 2015. Asset DerivativesLiability Derivatives June 30, 2016December 31, 2015June 30, 2016December 31, 2015 BalanceSheetLocationFairValueBalanceSheetLocationFairValueBalanceSheetLocationFairValueBalanceSheetLocationFairValueDerivatives designated as hedging instruments:        Interest rate contractsOther Assets$5Other Assets$36Other Liabilities$5,092Other Liabilities$2,921Derivatives not designated as hedging instruments:        Interest rate contractsOther Assets$11,971Other Assets$4,938Other Liabilities$12,669Other Liabilities$5,149                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Amount of gain (loss) recognized in other comprehensive income                           | The amount of gain (loss) recognized in other comprehensive income is included in the table below for the periods indicated.Derivatives in Cash Flow Hedging RelationshipsAmount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)Three Months EndedSix Months EndedJune 30, 2016June 30, 2015June 30, 2016June 30, 2015Interest Rate Products$(813)$807$(2,767)$(469)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Schedule of derivative instruments, gain (loss) in Income Statement                      | The tables below present the effect of the Corporation’s derivative financial instruments on the Income Statement for the three and six months ended June 30, 2016, and 2015.Derivatives Not Designated asHedging Instruments underFASB ASC 815-10Location of Gain (Loss)Recognized Income onDerivativeAmount of Gain (Loss) Recognized in Income on DerivativeThree Months EndedJune 30, 2016Three Months Ended June 30, 2015Interest rate contractsOther income$(242)$156Derivatives Not Designated asHedging Instruments underFASB ASC 815-10Location of Gain (Loss)Recognized Income onDerivativeAmount of Gain (Loss) Recognized in Income on DerivativeSix Months Ended June 30, 2016Six Months Ended June 30, 2015Interest rate contractsOther income$(488)$55The amount of gain (loss) reclassified from other comprehensive income into income is included in the table below for the periods indicated.Derivatives Designated asHedging Instruments underFASB ASC 815-10Location of Gain (Loss)Recognized Income onDerivativeAmount of Gain (Loss) Reclassed from Other Comprehensive Income into Income  (Effective Portion)Three Months EndedJune 30, 2016Three Months Ended June 30, 2015Interest rate contractsInterest Expense(318)(358)Derivatives Designated asHedging Instruments underFASB ASC 815-10Location of Gain (Loss)Recognized Income onDerivativeAmount of Gain (Loss) Reclassed from Other Comprehensive Income into Income  (Effective Portion)Six Months EndedJune 30, 2016Six Months Ended June 30, 2015Interest rate contractsInterest Expense$(642)$(712) |

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| - Definition
Tabular disclosure of the effective portion of the gains and losses on derivative instruments designated (and non-derivative instruments) designated and qualifying in cash flow hedges and net investment hedges that was recognized in other comprehensive income (loss) during the current period.
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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.
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Reference 1: 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=64837297&loc=SL5624171-113959Reference 2: 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=64837297&loc=SL5618551-113959
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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.
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