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Derivatives and Hedging Activities (Derivative Financial Instruments included in OCI and Current Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 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
Derivatives designated as hedges [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain reclassified from OCI into interest income or interest expense (effective portion) 4,380 1,586
Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Other income (2,601) (723)
Other expense | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Other income 6 22
Changes in fair value of mortgage derivatives | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Other income (283) (24)
Total | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Mortgage banking income (2,324) (721)
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 $ (6,583) $ 22,984