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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax $ 0 $ 0    
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) 3,976 394 $ 5,562 $ 818
Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Other income 3,350 1,492 2,627 1,563
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 3 14 25 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 0 (10) (24) (11)
Total | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Mortgage banking income 3,347 1,488 2,626 1,547
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 $ 197 $ 8,590 $ 23,181 $ 11,875