Allowance for Loan Losses Allowance for Loan Losses (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	$ 27,069	$ 28,023
Charge-offs	(1,475)	(321)
Recoveries	43	108
Provision	500	0
Allowance, Ending Balance	26,137	27,810
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	9,140	8,202
Charge-offs	(1,253)	(200)
Recoveries	4	80
Provision	695	249
Allowance, Ending Balance	8,586	8,331
Commercial Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	1,758	1,300
Charge-offs	0	0
Recoveries	0	0
Provision	(115)	(71)
Allowance, Ending Balance	1,643	1,229
Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	8,202	7,987
Charge-offs	(8)	(7)
Recoveries	26	14
Provision	41	(191)
Allowance, Ending Balance	8,261	7,803
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	19,100	17,489
Charge-offs	(1,261)	(207)
Recoveries	30	94
Provision	621	(13)
Allowance, Ending Balance	18,490	17,363
Residential Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	5,460	5,430
Charge-offs	(136)	(48)
Recoveries	2	2
Provision	37	(29)
Allowance, Ending Balance	5,363	5,355
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	2,509	2,713
Charge-offs	(78)	(66)
Recoveries	11	12
Provision	(158)	72
Allowance, Ending Balance	2,284	2,731
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, Beginning Balance	0	2,391
Charge-offs	0	0
Recoveries	0	0
Provision	0	(30)
Allowance, Ending Balance	$ 0	$ 2,361