Fair Value (Additional Information) (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loan held for sale, at fair value		$ 5,135,000		$ 5,135,000		$ 10,762,000
Contractual principal balance of Loan held for sale		5,007,000		5,007,000		10,559,000
Difference in amount of loan held for sale		128,000		128,000		203,000
Impaired loans, carrying amount	[1]	2,398,000		2,398,000		3,610,000
Valuation allowance for loans losses		1,165,000		1,165,000		1,202,000
Cost of real estate sales		0	$ 0	0	$ 0	0
Other real estate, carrying value		0		0		0
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		719,916,000		719,916,000		637,840,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		8,566,000		8,566,000		9,373,000
Obligations of State and Political Subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total gains/loss included in earnings attributable to other changes in fair value		17,000	(81,000)	38,000	(45,000)
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		244,208,000		244,208,000		203,628,000
Total gains/loss included in earnings attributable to other changes in fair value		17,000	(81,000)	38,000	(45,000)
Obligations of State and Political Subdivisions | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		8,213,000		8,213,000		9,020,000
Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total gains/loss included in earnings attributable to interest income		0	0	0	0
Equity Securities | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		353,000		353,000		353,000
Total gains/loss included in earnings attributable to other changes in fair value		0	0	0	0
Equity Securities | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		353,000		353,000		353,000
Commercial Real Estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, carrying amount		2,248,000		2,248,000		2,148,000
Valuation allowance for loans losses		1,165,000		1,165,000		1,173,000
Increase (decrease) to provision for loan losses		$ (5,000)	$ 49,000	$ (8,000)	$ 35,000	$ (286,000)

[1] Unpaid Principal Balance is the remaining contractual payments gross of partial charge-offs.