Loans (Troubled Debt Restructuring) (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017 USD ($) loan	Sep. 30, 2016 USD ($) loan	Sep. 30, 2017 USD ($) loan	Sep. 30, 2016 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of loans modified as a troubled debt restructuring | loan		0	5	0	7
Troubled debt restructuring, pre-modification recorded investment	[1]	$ 0	$ 914	$ 0	$ 4,597
Troubled debt restructuring, post-modification recorded investment	[1]	$ 0	$ 914	$ 0	$ 4,597
Commercial Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as a troubled debt restructuring | loan		0	0	0	0
Troubled debt restructuring, pre-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Troubled debt restructuring, post-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Commercial Construction & Development [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as a troubled debt restructuring | loan		0	0	0	0
Troubled debt restructuring, pre-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Troubled debt restructuring, post-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Commercial & Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as a troubled debt restructuring | loan		0	5	0	6
Troubled debt restructuring, pre-modification recorded investment	[1]	$ 0	$ 914	$ 0	$ 1,047
Troubled debt restructuring, post-modification recorded investment	[1]	$ 0	$ 914	$ 0	$ 1,047
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as a troubled debt restructuring | loan		0	0	0	1
Troubled debt restructuring, pre-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 3,550
Troubled debt restructuring, post-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 3,550
Homeowner Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as a troubled debt restructuring | loan		0	0	0	0
Troubled debt restructuring, pre-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Troubled debt restructuring, post-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as a troubled debt restructuring | loan		0	0	0	0
Troubled debt restructuring, pre-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Troubled debt restructuring, post-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Home Equity Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as a troubled debt restructuring | loan		0	0	0	0
Troubled debt restructuring, pre-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Troubled debt restructuring, post-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as a troubled debt restructuring | loan		0	0	0	0
Troubled debt restructuring, pre-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Troubled debt restructuring, post-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0

[1] The recorded investment in troubled debt restructurings consists of unpaid principal balance, net of charge-offs and unamortized deferred loan origination fees and costs, at the time of the restructuring. For accruing troubled debt restructured loans, the recorded investment also includes accrued interest.