Allowance for Loan Losses (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		$ 27,069	$ 28,023	$ 27,886
Charge-offs		(7,012)	(2,305)	(1,949)
Recoveries		297	301	236
Provision		5,650	1,050	1,850
Ending Balance		26,004	27,069	28,023
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		9,140	8,202	8,022
Charge-offs		(5,816)	(809)	(977)
Recoveries		56	92	24
Provision		6,591	1,655	1,133
Ending Balance		9,971	9,140	8,202
Commercial Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		1,758	1,300	383
Charge-offs		0	0	0
Recoveries		0	0	0
Provision		(563)	458	917
Ending Balance		1,195	1,758	1,300
Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	[1]	8,202	7,987	7,835
Charge-offs	[1]	(759)	(671)	(558)
Recoveries	[1]	156	87	86
Provision	[1]	(607)	799	624
Ending Balance	[1]	6,992	8,202	7,987
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		19,100	17,489	16,240
Charge-offs		(6,575)	(1,480)	(1,535)
Recoveries		212	179	110
Provision		5,421	2,912	2,674
Ending Balance		18,158	19,100	17,489
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		5,460	5,430	6,450
Charge-offs		(200)	(207)	(132)
Recoveries		11	28	51
Provision		(19)	209	(939)
Ending Balance		5,252	5,460	5,430
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		2,509	2,713	2,511
Charge-offs		(237)	(618)	(282)
Recoveries		74	94	75
Provision		248	320	409
Ending Balance		2,594	2,509	2,713
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		$ 0	2,391	2,685
Charge-offs			0	0
Recoveries			0	0
Provision			(2,391)	(294)
Ending Balance			$ 0	$ 2,391

[1] Commercial & industrial loans.