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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) property	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Outstanding Balance	$ 1,689,000		$ 1,689,000		$ 1,821,000
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Carrying Amount	1,345,000		1,345,000		1,386,000	$ 1,368,000
Real Estate Acquired Through Foreclosure	4,523,000		4,523,000		5,302,000
Loans and Leases Receivable, Gross	735,222,000		735,222,000		714,105,000
Impaired Financing Receivable, Recorded Investment	3,198,000		3,198,000		2,624,000
Impaired Financing Receivable, Related Allowance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,198,000		3,198,000		2,624,000
Write downs	90,000	$ 2,553,000	274,000	$ 2,689,000
Gross Realized Losses on Loans			0
Proceeds from Sale of Mortgage Loans Held-for-sale			1,760,000	1,739,000
Commercial Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	78,400,000		$ 78,400,000
Commercial Rentals [Member] | Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage			10.70%
Hospitality Lodging Industry [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	50,000,000		$ 50,000,000
Hospitality Lodging Industry [Member] | Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage			6.80%
Troubled Debt Restructured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Related Allowance	0		$ 0		0
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Carrying Amount	831,000		831,000		821,000
Real Estate Acquired Through Foreclosure	0		0
Mortgage Loans in Process of Foreclosure, Amount	630,000		$ 630,000
Number Of Properties Under Foreclosure Proceedings | property			11
Loans and Leases Receivable, Gross	234,251,000		$ 234,251,000		237,177,000
Impaired Financing Receivable, Recorded Investment	23,000		23,000		23,000
Impaired Financing Receivable, Related Allowance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	23,000		23,000		23,000
Write downs	44,000	17,000	83,000	17,000
Gross Realized Gains on Loans		22,000		54,000
Gross Realized Losses on Loans		0		0
Proceeds from Sale of Mortgage Loans Held-for-sale		726,000		1,700,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Carrying Amount	514,000		514,000		565,000
Loans and Leases Receivable, Gross	335,602,000		335,602,000		320,187,000
Impaired Financing Receivable, Recorded Investment	3,175,000		3,175,000		2,601,000
Impaired Financing Receivable, Related Allowance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,175,000		3,175,000		$ 2,601,000
Write downs	11,000	$ 2,513,000	96,000	$ 2,642,000
Gross Realized Gains on Loans	67,000
Proceeds from Sale of Mortgage Loans Held-for-sale	1,700,000
Delaware Bancshares, Inc. Acquisition [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Outstanding Balance	$ 1,397,000		1,397,000
Assets, Fair Value Adjustment			$ 499,000

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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