Borrowed Funds (Summary of Subordinated Debentures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total borrowed funds	$ 902,749	$ 920,542
Subordinated debenture maturing June 26, 2033
Debt Instrument [Line Items]
Total borrowed funds	4,826	4,803
Subordinated debenture maturing March 17, 2034
Debt Instrument [Line Items]
Total borrowed funds	4,739	4,704
Subordinated debenture maturing September 15, 2029
Debt Instrument [Line Items]
Total borrowed funds	74,026	73,926
Subordinated Debentures Maturing June 26, 2033, March 17, 2034 and September 15, 2029
Debt Instrument [Line Items]
Total borrowed funds	$ 83,591	$ 83,433
LIBOR | Subordinated debenture maturing June 26, 2033
Debt Instrument [Line Items]
Variable interest rate spread (as a percent)	3.10%
LIBOR | Subordinated debenture maturing March 17, 2034
Debt Instrument [Line Items]
Variable interest rate spread (as a percent)	2.79%