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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivatives designated as hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings $ 0 $ 0    
Gain reclassified from OCI into interest income or interest expense (effective portion) 352 268 $ 1,170 $ 525
Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Other income 374 (146) 1,937 13
Interest Expense [Member] | Derivatives designated as hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings 0 0    
Other expense | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Other income 10 3 37 27
Changes in fair value of mortgage derivatives | Derivatives designated as hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings 0 0    
Changes in fair value of mortgage derivatives | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Other income (2) (10) (13) (28)
Total | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Mortgage banking income 366 (139) 1,913 14
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 $ 3,030 $ (405) $ 14,905 $ (302)