Derivative Instruments Derivative Instruments (Summary of Cash Flow Hedge Activity) (Details) - Designated as Hedging Instrument [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Summary of Cash Flow Hedge Activity [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 8,381
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	(760)
Interest Rate Floor [Member]
Summary of Cash Flow Hedge Activity [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	8,381
Interest and Fee Income on Loans [Member] | Interest Rate Floor [Member]
Summary of Cash Flow Hedge Activity [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ (760)