Derivatives and Hedging Derivatives and Hedging (Schedule of customer loan swaps) (Details) - Interest Rate Swap [Member] $ in Thousands	Dec. 31, 2020 USD ($) derivative	Dec. 31, 2019 USD ($) derivative
Derivative [Line Items]
Derivative, Fair Value, Net	$ (10,350)	$ (8,187)
Derivative, Notional Amount	$ 53,000	$ 43,000
federal home loan bank 30-day [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	80	75
Derivative, Fair Value, Net	$ 39,627	$ 17,756
Derivative, Notional Amount	$ 376,290	$ 366,351
Other Liabilities [Member] | federal home loan bank 30-day [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	0	10
Derivative, Fair Value, Net	$ 0	$ (514)
Derivative, Notional Amount	$ 0	$ 45,243
Commercial and Industrial Sector [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	80	85
Derivative, Fair Value, Net	$ (39,627)	$ (17,242)
Derivative, Notional Amount	$ 376,290	$ 411,594
Loans [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	160	170
Derivative, Fair Value, Net	$ 0	$ 0
Derivative, Notional Amount	$ 752,580	$ 823,188