Allowance for Loan Losses (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		$ 28,023	$ 27,886	$ 30,873
Charge-offs		(2,305)	(1,949)	(6,022)
Recoveries		301	236	635
Provision		1,050	1,850	2,400
Ending Balance		27,069	28,023	27,886
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		8,202	8,022	9,817
Charge-offs		(809)	(977)	(5,213)
Recoveries		92	24	380
Provision		1,655	1,133	3,038
Ending Balance		9,140	8,202	8,022
Commercial Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		1,300	383	224
Charge-offs		0	0	0
Recoveries		0	0	0
Provision		458	917	159
Ending Balance		1,758	1,300	383
Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	[1]	7,987	7,835	8,934
Charge-offs	[1]	(671)	(558)	(358)
Recoveries	[1]	87	86	153
Provision	[1]	799	624	(894)
Ending Balance	[1]	8,202	7,987	7,835
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		17,489	16,240	18,975
Charge-offs		(1,480)	(1,535)	(5,571)
Recoveries		179	110	533
Provision		2,912	2,674	2,303
Ending Balance		19,100	17,489	16,240
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		5,430	6,450	6,428
Charge-offs		(207)	(132)	(128)
Recoveries		28	51	3
Provision		209	(939)	147
Ending Balance		5,460	5,430	6,450
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		2,713	2,511	2,684
Charge-offs		(618)	(282)	(323)
Recoveries		94	75	99
Provision		320	409	51
Ending Balance		2,509	2,713	2,511
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		2,391	2,685	2,786
Charge-offs		0	0	0
Recoveries		0	0	0
Provision		(2,391)	(294)	(101)
Ending Balance		$ 0	$ 2,391	$ 2,685

[1] Commercial & industrial loans.