Loans (Schedule of Recorded Investment in Home Equity, Consumer and Residential Mortgage Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	$ 2,154,502	[1]	$ 2,001,415	[2]
Home Equity Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	152,757	[1]	134,032	[2]
Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	67,647	[1]	60,099	[2]
Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	179,199	[1]	183,770	[2]
Performing | Home Equity Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	152,558		133,959
Performing | Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	67,361		60,014
Performing | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	178,712		182,421
Nonperforming | Home Equity Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	199		73
Nonperforming | Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	286		85
Nonperforming | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	487		1,349
Loans Acquired with Deteriorated Credit Quality
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	9,117		11,048		$ 7,555
Loans Acquired with Deteriorated Credit Quality | Home Equity Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	0		0
Loans Acquired with Deteriorated Credit Quality | Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	0		53		0
Loans Acquired with Deteriorated Credit Quality | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	$ 888		$ 945		$ 867

[1] Total recorded investment in loans includes $9,483 in accrued interest.

[2] Total recorded investment in loans includes $8,011 in accrued interest.