|**Derivative Financial Instruments (Tables)**                                                 | 3 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 ofMarch 31, 2016, andDecember 31, 2015.Asset DerivativesLiability DerivativesMarch 31, 2016December 31, 2015March 31, 2016December 31, 2015BalanceSheetLocationFairValueBalanceSheetLocationFairValueBalanceSheetLocationFairValueBalanceSheetLocationFairValueDerivatives designated as hedging instruments:Interest rate contractsOther Assets$12Other Assets$36Other Liabilities$4,565Other Liabilities$2,921Derivatives not designated as hedging instruments:Interest rate contractsOther Assets$8,635Other Assets$4,938Other Liabilities$9,091Other Liabilities$5,149                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
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|                                                                                              | Asset Derivatives                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|                                                                                              | BalanceSheetLocation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Derivatives designated as hedging instruments:                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Interest rate contracts                                                                       | Other Assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Derivatives not designated as hedging instruments:                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Interest rate contracts                                                                       | Other Assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|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 months ended March 31, 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 EndedMarch 31, 2016Three Months Ended March 31, 2015Interest rate contractsOther income$(245)$(100)The amount of gain (loss) recognized in other comprehensive income is included in the table below for the periods indicated.Derivatives in Cash Flow Hedging RelationshipsAmount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)Three Months EndedMarch 31, 2016March 31, 2015Interest Rate Products$(1,954)$(1,276)The amount of gain (loss) reclassified from other comprehensive income into income is included in the table below for the periods indicated.Location of Loss Reclassified from Accumulated Other Comprehensive Income (Effective Portion)Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion)Three Months EndedMarch 31, 2016March 31, 2015Interest Expense$(324)$(354)
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|Derivatives Not Designated asHedging Instruments underFASB ASC 815-10                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|Interest rate contracts                                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|Derivatives in Cash Flow Hedging Relationships                                                | Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Three Months Ended                                                                           
|March 31, 2016                                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Interest Rate Products                                                                        | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|Location of 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                                                                           
|March 31, 2016                                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Interest Expense                                                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

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