Allowance for Loan Losses (Allowance for Loan Losses Rollforward Analysis) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	$ 27,269	$ 27,884	$ 27,886	$ 30,873
Charge-offs	(148)	(770)	(1,638)	(5,319)
Recoveries	47	194	170	454
Provision	600	700	1,350	2,000
Allowance, Ending Balance	27,768	28,008	27,768	28,008
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	6,973	6,748	6,969	9,407
Charge-offs	0	(640)	(977)	(4,754)
Recoveries	7	38	19	230
Provision	133	493	1,102	1,756
Allowance, Ending Balance	7,113	6,639	7,113	6,639
Commercial Construction and Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	494	277	362	224
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	206	164	338	217
Allowance, Ending Balance	700	441	700	441
Commercial Other [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	5,454	5,442	5,433	5,996
Charge-offs	(92)	(81)	(403)	(259)
Recoveries	29	83	75	127
Provision	162	126	448	(294)
Allowance, Ending Balance	5,553	5,570	5,553	5,570
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	12,921	12,467	12,764	15,627
Charge-offs	(92)	(721)	(1,380)	(5,013)
Recoveries	36	121	94	357
Provision	501	783	1,888	1,679
Allowance, Ending Balance	13,366	12,650	13,366	12,650
Residential Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	4,840	4,691	4,700	4,269
Charge-offs	0	0	(72)	(48)
Recoveries	1	0	36	3
Provision	94	(11)	271	456
Allowance, Ending Balance	4,935	4,680	4,935	4,680
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	2,569	2,455	2,511	2,684
Charge-offs	(56)	(49)	(186)	(258)
Recoveries	10	73	40	94
Provision	227	16	385	(25)
Allowance, Ending Balance	2,750	2,495	2,750	2,495
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	6,939	8,271	7,911	8,293
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(222)	(88)	(1,194)	(110)
Allowance, Ending Balance	$ 6,717	$ 8,183	$ 6,717	$ 8,183