Derivatives and Hedging Derivatives and Hedging (Schedule of customer loan swaps) (Details) - Interest Rate Swap [Member] $ in Thousands	Dec. 31, 2019 USD ($) derivative	Dec. 31, 2018 USD ($) derivative
Derivative [Line Items]
Derivative, Notional Amount	$ 43,000	$ 43,000
Derivative, Fair Value, Net	$ (8,187)	$ (5,682)
federal home loan bank 30-day [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	75	25
Derivative, Notional Amount	$ 366,351	$ 118,891
Derivative, Fair Value, Net	$ 17,756	$ 3,467
Other Liabilities [Member] | federal home loan bank 30-day [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	10	57
Derivative, Notional Amount	$ 45,243	$ 297,624
Derivative, Fair Value, Net	$ (514)	$ (7,841)
Commercial and Industrial Sector [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	85	82
Derivative, Notional Amount	$ 411,594	$ 416,515
Derivative, Fair Value, Net	$ (17,242)	$ 4,374
Loans [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	170	164
Derivative, Notional Amount	$ 823,188	$ 833,030
Derivative, Fair Value, Net	$ 0	$ 0