Loans and Allowance for Loan and Lease Losses (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) loan	Mar. 31, 2015 USD ($) loan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	$ 6,439,000	$ 6,566,000	$ 6,168,000	$ 6,716,000
Financing Receivable Deferred Fees And Costs	209,000		178,000
Financing Receivable, Modifications, Recorded Investment	$ 2,781,000		2,805,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	0	0
Other Real Estate	$ 203,000		358,000
Nonaccruing [Member] | One Large Relationships [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,347,000		1,370,000
Nonaccruing [Member] | Nine Loans With Four Relationships [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment			2,346,000
Nonaccruing [Member] | Eight Loans With Three Relationships [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,821,000
Accruing [Member] | Five Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	960,000
Accruing [Member] | Four Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	587,000		459,000
Accruing [Member] | One Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	525,000
Unfunded Lending Commitments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	117,000		94,500
Commercial Portfolio [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	$ 1,427,000	$ 1,639,000	1,393,000	1,393,000
Impaired Financing Receivable, Interest Income, Cash Basis Method
Commercial Portfolio [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	$ 3,777,000	$ 3,626,000	3,552,000	3,925,000
Impaired Financing Receivable, Interest Income, Cash Basis Method
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Accruing [Member] | 2 Relationship [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment			395,000
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Accruing [Member] | One Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 373,000
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	119,000	$ 35,000	153,000	33,000
Commercial Portfolio [Member] | Lease Financing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	1,000	1,000	1,000	2,000
Consumer Portfolio [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	516,000	$ 544,000	534,000	450,000
Impaired Financing Receivable, Interest Income, Cash Basis Method	6,000
Consumer Portfolio [Member] | Residential Mortgage [Member] | Accruing [Member] | Three Unrelated Borrowers [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment			64,000
Consumer Portfolio [Member] | Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	$ 303,000	$ 519,000	317,000	653,000
Impaired Financing Receivable, Interest Income, Cash Basis Method
Consumer Portfolio [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	$ 9,000	$ 37,000	12,000	35,000
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	$ 287,000	$ 165,000	$ 206,000	$ 225,000