Allowance for Loan Losses (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance		$ 27,072	$ 26,488
Charge-offs		(103)	(690)
Recoveries		25	66
Provision		650	0
Allowance, Ending Balance		27,644	25,864
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	[1]	15,381	12,729
Charge-offs	[1]	0	(627)
Recoveries	[1]	0	25
Provision	[1]	1,810	(308)
Allowance, Ending Balance	[1]	17,191	11,819
Commercial & Industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	[2]	5,847	5,580
Charge-offs	[2]	(14)	(6)
Recoveries	[2]	8	29
Provision	[2]	(1,343)	268
Allowance, Ending Balance	[2]	4,498	5,871
Total Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance		21,228	18,309
Charge-offs		(14)	(633)
Recoveries		8	54
Provision		467	(40)
Allowance, Ending Balance		21,689	17,690
Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance		3,987	5,427
Charge-offs		0	0
Recoveries		0	0
Provision		22	67
Allowance, Ending Balance		4,009	5,494
Home Equity
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance		1,603	2,412
Charge-offs		(61)	(35)
Recoveries		13	7
Provision		34	(192)
Allowance, Ending Balance		1,589	2,192
Other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance		254	340
Charge-offs		(28)	(22)
Recoveries		4	5
Provision		127	165
Allowance, Ending Balance		357	488
Total Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance		1,857	2,752
Charge-offs		(89)	(57)
Recoveries		17	12
Provision		161	(27)
Allowance, Ending Balance		$ 1,946	$ 2,680

[1] Commercial real estate loans.

[2] Commercial & industrial loans.