Loans (Troubled Debt Restructurings) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring | loan		0	13
Pre-Modification Recorded Investment	[1]	$ 0	$ 11,391
Post-Modification Recorded Investment	[1]	$ 0	$ 11,391
Commercial Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring | loan		0	1
Pre-Modification Recorded Investment	[1]	$ 0	$ 776
Post-Modification Recorded Investment	[1]	$ 0	$ 776
Commercial Construction & Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring | loan		0	0
Pre-Modification Recorded Investment	[1]	$ 0	$ 0
Post-Modification Recorded Investment	[1]	$ 0	$ 0
Commercial & Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring | loan		0	9
Pre-Modification Recorded Investment	[1]	$ 0	$ 6,229
Post-Modification Recorded Investment	[1]	$ 0	$ 6,229
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring | loan		0	3
Pre-Modification Recorded Investment	[1]	$ 0	$ 4,386
Post-Modification Recorded Investment	[1]	$ 0	$ 4,386
Homeowner Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring | loan		0	0
Pre-Modification Recorded Investment	[1]	$ 0	$ 0
Post-Modification Recorded Investment	[1]	$ 0	$ 0
Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring | loan		0	0
Pre-Modification Recorded Investment	[1]	$ 0	$ 0
Post-Modification Recorded Investment	[1]	$ 0	$ 0
Home Equity Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring | loan		0	0
Pre-Modification Recorded Investment	[1]	$ 0	$ 0
Post-Modification Recorded Investment	[1]	$ 0	$ 0
Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring | loan		0	0
Pre-Modification Recorded Investment	[1]	$ 0	$ 0
Post-Modification Recorded Investment	[1]	$ 0	$ 0
Payment Default [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring | loan		0	7

[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.