Assets and Liabilities Subject to Enforceable Master Netting Arrangements (Schedule of Assets and Liabilities Subject to an Enforceable Master Netting Arrangement or Repurchase Agreements) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investment security collateral as a percentage of borrowing	102.00%
Repurchase Agreements [Member]
Gross Amounts of Recognized (Assets)/Liabilities	$ 72,396	$ 49,160
Gross Amounts Offset in the Statement of Condition
Net Amounts of (Assets)/Liabilities Presented in the Statement of Condition	72,396	49,160
Gross Amounts Not Offset in the Statement of Condition: Financial Instruments	(72,396)	(49,160)
Gross Amounts Not Offset in the Statement of Condition: Cash Collateral Pledged
Net amount
Interest Rate Swap Agreements [Member]
Gross Amounts of Recognized (Assets)/Liabilities	727	1,320
Gross Amounts Offset in the Statement of Condition
Net Amounts of (Assets)/Liabilities Presented in the Statement of Condition	727	1,320
Gross Amounts Not Offset in the Statement of Condition: Financial Instruments	(727)	(1,320)
Gross Amounts Not Offset in the Statement of Condition: Cash Collateral Pledged	2,000
Net amount