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Derivatives and Hedging Activities (Derivative Financial Instruments included in OCI and Current Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent $ 109 $ 674 $ 8 $ 653
Derivatives designated as hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Loss reclassified from OCI into interest expense (effective portion) (91) (648) (264) (1,949)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0 0    
Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Other income (33) 61 61 444
Interest Expense [Member] | Derivatives designated as hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0 0    
Other expense | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Other income 7 (42) 7 71
Changes in fair value of mortgage derivatives | Derivatives designated as hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0 0    
Changes in fair value of mortgage derivatives | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Other income (7) (12) (17) (46)
Total | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Mortgage banking income (33) 115 71 419
Derivatives designated as hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent $ 109 $ 674 $ 8 $ 653