Allowance for Loan Losses (Allowance for Loan Losses Rollforward Analysis) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	$ 27,886		$ 30,873		$ 29,802
Charge-offs	(1,949)		(6,022)		(2,335)
Recoveries	236		635		706
Provision	1,850		2,400		2,700
Ending Balance	28,023		27,886		30,873
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	8,022		9,817		8,580
Charge-offs	(977)		(5,213)		(485)
Recoveries	24		380		442
Provision	1,133		3,038		1,280
Ending Balance	8,202		8,022		9,817
Commercial Construction and Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	383		224		95
Charge-offs	0		0		0
Recoveries	0		0		0
Provision	917		159		129
Ending Balance	1,300		383		224
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	7,835	[1]	8,934	[1]	8,709	[1]
Charge-offs	(558)	[1]	(358)	[1]	(1,179)	[1]
Recoveries	86	[1]	153	[1]	103	[1]
Provision	624	[1]	(894)	[1]	1,301	[1]
Ending Balance	7,987	[1]	7,835	[1]	8,934	[1]
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	16,240		18,975		17,384
Charge-offs	(1,535)		(5,571)		(1,664)
Recoveries	110		533		545
Provision	2,674		2,303		2,710
Ending Balance	17,489		16,240		18,975
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	6,450		6,428		6,867
Charge-offs	(132)		(128)		(367)
Recoveries	51		3		110
Provision	(939)		147		(182)
Ending Balance	5,430		6,450		6,428
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	2,511		2,684		2,452
Charge-offs	(282)		(323)		(304)
Recoveries	75		99		51
Provision	409		51		485
Ending Balance	2,713		2,511		2,684
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	2,685		2,786		3,099
Charge-offs	0		0		0
Recoveries	0		0		0
Provision	(294)		(101)		(313)
Ending Balance	$ 2,391		$ 2,685		$ 2,786

[1] Commercial & industrial loans.