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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax $ 0 $ 0 $ 0 $ 0
Derivatives designated as hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain reclassified from OCI into interest income or interest expense (effective portion) 4,698 3,976 9,078 5,562
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings 0 0    
Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Other income (1,237) 3,350 (3,838) 2,627
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 77 3 83 25
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 (11) 0 (294) (24)
Total | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Mortgage banking income (1,303) 3,347 (3,627) 2,626
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 $ (1,593) $ 197 $ (8,176) $ 23,181