Derivatives and Hedging Activities (Interest Rate Swaps Subject to Master Netting Agreements) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts Recognized, Derivative assets	$ 0	$ 876
Gross Amounts Recognized, Derivative liabilities	(52,013)	(16,914)
Gross Amounts Recognized, Derivative assets and liabilities	(52,013)	(16,038)
Gross Amounts Offset in Balance Sheet, Derivative assets	0	0
Gross Amounts Offset in Balance Sheet, Derivative liabilities	0	0
Gross Amounts Offset in Balance Sheet, Derivative assets and liabilities	0	0
Net Amounts Presented in Balance Sheet, Derivative assets	0	876
Net Amounts Presented in Balance Sheet, Derivative liabilities	(52,013)	(16,914)
Net Amounts Presented in Balance Sheet, Derivative assets and liabilities	(52,013)	(16,038)
Gross Amounts Not Offset in Balance Sheet
Derivative Instruments, Derivative assets	0	(876)
Derivative Instruments, Derivative liabilities	0	876
Derivative Instruments, Derivative assets and liabilities	0	0
Collateral Pledged, Derivative assets	0	0
Collateral Pledged, Derivative liabilities	(51,887)	(16,038)
Collateral Pledged, Derivative assets and liabilities	51,887	16,038
Net Amount, Derivative assets	0	0
Net Amount, Derivative liabilities	(126)	0
Net Amount, Derivative assets and liabilities	$ (126)	$ 0