Allowance for Loan Losses (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	$ 27,587	$ 27,269	$ 28,023	$ 27,886
Charge-offs	(725)	(148)	(1,401)	(1,638)
Recoveries	99	47	239	170
Provision	200	600	300	1,350
Allowance, Ending Balance	27,161	27,768	27,161	27,768
Reclassification of unallocated allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Ending Balance	4,200		4,200
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	8,529	8,192	8,202	8,022
Charge-offs	0	0	(400)	(977)
Recoveries	4	7	88	19
Provision	(38)	57	605	1,192
Allowance, Ending Balance	8,495	8,256	8,495	8,256
Commercial Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	1,684	494	1,300	383
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	5	206	389	317
Allowance, Ending Balance	1,689	700	1,689	700
Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	7,010	7,888	7,987	7,835
Charge-offs	(378)	(92)	(429)	(403)
Recoveries	30	29	62	75
Provision	691	(611)	(267)	(293)
Allowance, Ending Balance	7,353	7,214	7,353	7,214
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	17,223	16,574	17,489	16,240
Charge-offs	(378)	(92)	(829)	(1,380)
Recoveries	34	36	150	94
Provision	658	(348)	727	1,216
Allowance, Ending Balance	17,537	16,170	17,537	16,170
Residential Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	5,405	6,191	5,430	6,450
Charge-offs	(34)	0	(88)	(72)
Recoveries	22	1	26	36
Provision	150	111	175	(111)
Allowance, Ending Balance	5,543	6,303	5,543	6,303
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	2,683	2,577	2,713	2,511
Charge-offs	(313)	(56)	(484)	(186)
Recoveries	43	10	63	40
Provision	(164)	221	(43)	387
Allowance, Ending Balance	2,249	2,752	2,249	2,752
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	2,276	1,927	2,391	2,685
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(444)	616	(559)	(142)
Allowance, Ending Balance	$ 1,832	$ 2,543	$ 1,832	$ 2,543