Allowance for Loan Losses Allowance for Loan Losses (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	$ 26,137	$ 27,810	$ 27,069	$ 28,023
Charge-offs	(860)	(355)	(2,335)	(676)
Recoveries	99	32	142	140
Provision	450	100	950	100
Allowance, Ending Balance	25,826	27,587	25,826	27,587
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	8,586	8,331	9,140	8,202
Charge-offs	(78)	(200)	(1,331)	(400)
Recoveries	13	4	17	84
Provision	1,892	394	2,587	643
Allowance, Ending Balance	10,413	8,529	10,413	8,529
Commercial Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	1,643	1,229	1,758	1,300
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(739)	455	(854)	384
Allowance, Ending Balance	904	1,684	904	1,684
Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	8,261	7,803	8,202	7,987
Charge-offs	(746)	(44)	(754)	(51)
Recoveries	62	18	88	32
Provision	(1,057)	(767)	(1,016)	(958)
Allowance, Ending Balance	6,520	7,010	6,520	7,010
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	18,490	17,363	19,100	17,489
Charge-offs	(824)	(244)	(2,085)	(451)
Recoveries	75	22	105	116
Provision	96	82	717	69
Allowance, Ending Balance	17,837	17,223	17,837	17,223
Residential Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	5,363	5,355	5,460	5,430
Charge-offs	(4)	(6)	(140)	(54)
Recoveries	2	2	4	4
Provision	108	54	145	25
Allowance, Ending Balance	5,469	5,405	5,469	5,405
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	2,284	2,731	2,509	2,713
Charge-offs	(32)	(105)	(110)	(171)
Recoveries	22	8	33	20
Provision	246	49	88	121
Allowance, Ending Balance	$ 2,520	2,683	$ 2,520	2,683
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance		2,361		2,391
Charge-offs		0		0
Recoveries		0		0
Provision		(85)		(115)
Allowance, Ending Balance		$ 2,276		$ 2,276