Assets and Liabilities Subject to Enforceable Master Netting Arrangements (Schedule of Liabilities Subject to an Enforceable Master Netting Arrangement or Repurchase Agreements) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investment security collateral as a percentage of borrowing	102.00%
Repurchase Agreements [Member]
Gross Amountsof Recognized(Assets)/Liabilities	$ 39,418	$ 48,728
Net Amounts of(Assets)/LiabilitiesPresented in theStatement ofCondition	39,418	48,728
Gross Amounts Not Offset in the Statment of Condition: Financial Instruments	(39,418)	(48,728)
Net amount
Interest Rate Swap Agreements [Member]
Gross Amountsof Recognized(Assets)/Liabilities	1,448	133
Net Amounts of(Assets)/LiabilitiesPresented in theStatement ofCondition	1,448	133
Gross Amounts Not Offset in the Statment of Condition: Financial Instruments	(1,448)	(133)
Net amount