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Derivatives and Hedging Activities (Derivative Financial Instruments included in OCI and Current Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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) 394 167 $ 818 $ 257
Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Other income 1,492 151 1,563 159
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 14 15 27 24
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 (10) (5) (11) (18)
Total | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Mortgage banking income 1,488 141 1,547 153
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 $ 8,590 $ (112) $ 11,875 $ 103