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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, 2020
Mar. 31, 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) 1,586 424
Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Other income (723) 71
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 22 13
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 (24) (1)
Total | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Mortgage banking income (expense) (721) 59
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 $ 22,984 $ 3,285