Allowance for Loan Losses (Allowance for Loan Losses Rollforward Analysis) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	$ 31,139	$ 30,045	$ 30,873	$ 29,802
Charge-offs	(4,175)	(696)	(4,549)	(1,377)
Recoveries	220	499	260	523
Provision	700	600	1,300	1,500
Allowance, Ending Balance	27,884	30,448	27,884	30,448
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	9,607	9,352	9,407	8,195
Charge-offs	(4,000)	0	(4,114)	(9)
Recoveries	186	388	192	390
Provision	955	(795)	1,263	369
Allowance, Ending Balance	6,748	8,945	6,748	8,945
Commercial Construction and Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	246	110	224	95
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	31	54	53	69
Allowance, Ending Balance	277	164	277	164
Commercial Other [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	5,966	5,906	5,996	6,200
Charge-offs	(85)	(580)	(178)	(910)
Recoveries	22	31	44	37
Provision	(461)	882	(420)	912
Allowance, Ending Balance	5,442	6,239	5,442	6,239
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	15,819	15,368	15,627	14,490
Charge-offs	(4,085)	(580)	(4,292)	(919)
Recoveries	208	419	236	427
Provision	525	141	896	1,350
Allowance, Ending Balance	12,467	15,348	12,467	15,348
Residential Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	4,533	4,325	4,269	4,694
Charge-offs	(39)	(16)	(48)	(250)
Recoveries	3	63	3	73
Provision	194	341	467	196
Allowance, Ending Balance	4,691	4,713	4,691	4,713
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	2,489	2,133	2,684	2,452
Charge-offs	(51)	(100)	(209)	(208)
Recoveries	9	17	21	23
Provision	8	331	(41)	114
Allowance, Ending Balance	2,455	2,381	2,455	2,381
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	8,298	8,219	8,293	8,166
Charge-offs
Recoveries
Provision	(27)	(213)	(22)	(160)
Allowance, Ending Balance	$ 8,271	$ 8,006	$ 8,271	$ 8,006