Loans (Credit Quality Indicators - Residential, Consumer) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Under 90 Days Past Due [Member] | Accruing Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	$ 1,083,088	$ 973,771
Under 90 Days Past Due [Member] | Nonaccrual Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	5,543	7,372
Under 90 Days Past Due [Member] | Homeowner Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	27,924	29,118
Under 90 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,116,555	1,010,261
Under 90 Days Past Due [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	264,200	255,047
Under 90 Days Past Due [Member] | Home Equity Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	36,614	46,427
Under 90 Days Past Due [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	38,375	42,811
Under 90 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	339,189	344,285
Over 90 Days Past Due [Member] | Accruing Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Over 90 Days Past Due [Member] | Nonaccrual Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	6,193	3,294
Over 90 Days Past Due [Member] | Homeowner Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Over 90 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	6,193	3,294
Over 90 Days Past Due [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	518
Over 90 Days Past Due [Member] | Home Equity Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	658	222
Over 90 Days Past Due [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	110	0
Over 90 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	$ 768	$ 740