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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	$ 27,884	$ 30,448	$ 30,873	$ 29,802
Charge-offs	(770)	(424)	(5,319)	(1,801)
Recoveries	194	128	454	651
Provision	700	600	2,000	2,100
Allowance, Ending Balance	28,008	30,752	28,008	30,752
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	6,748	8,945	9,407	8,195
Charge-offs	(640)	(258)	(4,754)	(267)
Recoveries	38	46	230	436
Provision	493	520	1,756	889
Allowance, Ending Balance	6,639	9,253	6,639	9,253
Commercial Construction and Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	277	164	224	95
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	164	54	217	123
Allowance, Ending Balance	441	218	441	218
Commercial Other [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	5,442	6,239	5,996	6,200
Charge-offs	(81)	(15)	(259)	(925)
Recoveries	83	37	127	74
Provision	126	245	(294)	1,157
Allowance, Ending Balance	5,570	6,506	5,570	6,506
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	12,467	15,348	15,627	14,490
Charge-offs	(721)	(273)	(5,013)	(1,192)
Recoveries	121	83	357	510
Provision	783	819	1,679	2,169
Allowance, Ending Balance	12,650	15,977	12,650	15,977
Residential Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	4,691	4,713	4,269	4,694
Charge-offs	0	(65)	(48)	(315)
Recoveries	0	24	3	97
Provision	(11)	(408)	456	(212)
Allowance, Ending Balance	4,680	4,264	4,680	4,264
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	2,455	2,381	2,684	2,452
Charge-offs	(49)	(86)	(258)	(294)
Recoveries	73	21	94	44
Provision	16	323	(25)	437
Allowance, Ending Balance	2,495	2,639	2,495	2,639
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	8,271	8,006	8,293	8,166
Charge-offs
Recoveries
Provision	(88)	(134)	(110)	(294)
Allowance, Ending Balance	$ 8,183	$ 7,872	$ 8,183	$ 7,872