Derivative Instruments (Offsetting Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivatives Assets
Gross Amounts of Recognized Financial Instruments	$ 42,714	$ 34,413
Gross Amounts Offset in the Consolidated Statements of Financial Position	(8,466)	(13,029)
Net Amounts Presented in the Consolidated Statements of Financial Position	34,248	21,384
Financial Instruments/ Collateral	(34,232)	(21,384)
Net Amount	16	0
Securities purchased under agreements to resell
Gross Amounts of Recognized Financial Instruments	0	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Presented in the Consolidated Statements of Financial Position	0	0
Financial Instruments/ Collateral	0	0
Net Amount	0	0
Total Assets
Gross Amounts of Recognized Financial Instruments	42,714	34,413
Gross Amounts Offset in the Consolidated Statements of Financial Position	(8,466)	(13,029)
Net Amounts Presented in the Consolidated Statements of Financial Position	34,248	21,384
Financial Instruments/ Collateral	(34,232)	(21,384)
Net Amount	16	0
Derivatives Liabilities
Gross Amounts of Recognized Financial Instruments	8,457	13,043
Gross Amounts Offset in the Consolidated Statements of Financial Position	(8,457)	(13,043)
Net Amounts Presented in the Consolidated Statements of Financial Position	0	0
Financial Instruments/ Collateral	0	0
Net Amount	0	0
Securities sold under agreements to repurchase
Gross Amounts of Recognized Financial Instruments	0	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Presented in the Consolidated Statements of Financial Position	0	0
Financial Instruments/ Collateral	0	0
Net Amount	0	0
Total Liabilities
Gross Amounts of Recognized Financial Instruments	8,457	13,043
Gross Amounts Offset in the Consolidated Statements of Financial Position	(8,457)	(13,043)
Net Amounts Presented in the Consolidated Statements of Financial Position	0	0
Financial Instruments/ Collateral	0	0
Net Amount	$ 0	$ 0