Investments (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013 Security	Sep. 30, 2012	Sep. 30, 2013 Security	Sep. 30, 2012	Dec. 31, 2012
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	$ 316,818,000		$ 316,818,000		$ 300,018,000
Gross Unrealized Gains	5,315,000		5,315,000		10,578,000
Gross Unrealized Losses	(3,681,000)		(3,681,000)		(344,000)
Fair Value	318,452,000		318,452,000		310,252,000
Number of securities owned with fair value than cost	75		75
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	138,719,000		138,719,000		33,620,000
Twelve Months or Greater, Fair Value	2,469,000		2,469,000		0
Total, Fair Value	141,188,000		141,188,000		33,620,000
Less than Twelve Months, Gross Unrealized Losses	(3,607,000)		(3,607,000)		(344,000)
Twelve Months or Greater, Gross Unrealized Losses	(74,000)		(74,000)		0
Total, Gross Unrealized Losses	(3,681,000)		(3,681,000)		(344,000)
Duration securities impaired, Minimum			1 year
Proceeds from sale of securities available-for-sale	121,000	1,709,000	15,894,000	18,363,000
Realized investment gains (losses) [Abstract]
Gross gains	91,000	240,000	525,000	561,000
Gross losses	0	0	(140,000)	0
Net gains	91,000	240,000	385,000	561,000
Investment securities pledged as collateral	205,600,000		205,600,000		193,300,000
Amortized Cost [Abstract]
Due in one year or less	12,531,000		12,531,000
Due after one year through five years	104,250,000		104,250,000
Due after five years through ten years	84,875,000		84,875,000
Due after ten years	114,359,000		114,359,000
Total	316,015,000		316,015,000
Fair Value [Abstract]
Due in one year or less	12,626,000		12,626,000
Due after one year through five years	104,486,000		104,486,000
Due after five years through ten years	84,107,000		84,107,000
Due after ten years	115,734,000		115,734,000
Total	316,953,000		316,953,000
U.S. Agency Securities [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	146,649,000		146,649,000		125,125,000
Gross Unrealized Gains	890,000		890,000		2,150,000
Gross Unrealized Losses	(1,607,000)		(1,607,000)		(41,000)
Fair Value	145,932,000		145,932,000		127,234,000
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	80,162,000		80,162,000		6,016,000
Twelve Months or Greater, Fair Value	0		0		0
Total, Fair Value	80,162,000		80,162,000		6,016,000
Less than Twelve Months, Gross Unrealized Losses	(1,607,000)		(1,607,000)		(41,000)
Twelve Months or Greater, Gross Unrealized Losses	0		0		0
Total, Gross Unrealized Losses	(1,607,000)		(1,607,000)		(41,000)
US Treasury Securities [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	11,850,000		11,850,000		4,922,000
Gross Unrealized Gains	0		0		25,000
Gross Unrealized Losses	(370,000)		(370,000)		0
Fair Value	11,480,000		11,480,000		4,947,000
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	11,480,000		11,480,000
Twelve Months or Greater, Fair Value	0		0
Total, Fair Value	11,480,000		11,480,000
Less than Twelve Months, Gross Unrealized Losses	(370,000)		(370,000)
Twelve Months or Greater, Gross Unrealized Losses	0		0
Total, Gross Unrealized Losses	(370,000)		(370,000)
Obligations of State and Political Subdivisions [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	95,608,000		95,608,000		95,288,000
Gross Unrealized Gains	2,594,000		2,594,000		5,721,000
Gross Unrealized Losses	(1,038,000)		(1,038,000)		(134,000)
Fair Value	97,164,000		97,164,000		100,875,000
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	20,396,000		20,396,000		7,981,000
Twelve Months or Greater, Fair Value	1,642,000		1,642,000		0
Total, Fair Value	22,038,000		22,038,000		7,981,000
Less than Twelve Months, Gross Unrealized Losses	(978,000)		(978,000)		(134,000)
Twelve Months or Greater, Gross Unrealized Losses	(60,000)		(60,000)		0
Total, Gross Unrealized Losses	(1,038,000)		(1,038,000)		(134,000)
Corporate Obligations [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	20,039,000		20,039,000		21,699,000
Gross Unrealized Gains	346,000		346,000		452,000
Gross Unrealized Losses	(476,000)		(476,000)		(42,000)
Fair Value	19,909,000		19,909,000		22,109,000
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	12,009,000		12,009,000		10,972,000
Twelve Months or Greater, Fair Value	0		0		0
Total, Fair Value	12,009,000		12,009,000		10,972,000
Less than Twelve Months, Gross Unrealized Losses	(476,000)		(476,000)		(42,000)
Twelve Months or Greater, Gross Unrealized Losses	0		0		0
Total, Gross Unrealized Losses	(476,000)		(476,000)		(42,000)
Mortgage-backed Securities in Government Sponsored Entities [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	41,869,000		41,869,000		52,072,000
Gross Unrealized Gains	789,000		789,000		1,728,000
Gross Unrealized Losses	(190,000)		(190,000)		(127,000)
Fair Value	42,468,000		42,468,000		53,673,000
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	14,672,000		14,672,000		8,651,000
Twelve Months or Greater, Fair Value	827,000		827,000		0
Total, Fair Value	15,499,000		15,499,000		8,651,000
Less than Twelve Months, Gross Unrealized Losses	(176,000)		(176,000)		(127,000)
Twelve Months or Greater, Gross Unrealized Losses	(14,000)		(14,000)		0
Total, Gross Unrealized Losses	(190,000)		(190,000)		(127,000)
Equity Securities in Financial Institutions [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	803,000		803,000		912,000
Gross Unrealized Gains	696,000		696,000		502,000
Gross Unrealized Losses	0		0		0
Fair Value	$ 1,499,000		$ 1,499,000		$ 1,414,000