Investments (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2013 Security	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2013 Security	Jun. 30, 2012	Dec. 31, 2012
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	$ 306,028,000			$ 306,028,000		$ 300,018,000
Gross Unrealized Gains	5,743,000			5,743,000		10,578,000
Gross Unrealized Losses	(3,836,000)			(3,836,000)		(344,000)
Fair Value	307,935,000			307,935,000		310,252,000
Number of securities owned with fair value than cost	74			74
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	145,678,000			145,678,000		33,620,000
Twelve Months or Greater, Fair Value	47,000			47,000		0
Total, Fair Value	145,725,000			145,725,000		33,620,000
Less than Twelve Months, Gross Unrealized Losses	(3,825,000)			(3,825,000)		(344,000)
Twelve Months or Greater, Gross Unrealized Losses	(11,000)			(11,000)		0
Total, Gross Unrealized Losses	(3,836,000)			(3,836,000)		(344,000)
Duration securities impaired, Minimum				1 year
Proceeds from sale of securities available-for-sale	11,917,000		5,418,000	15,773,000	16,654,000
Realized investment gains (losses) [Abstract]
Gross gains		238,000	213,000	434,000	321,000
Gross losses		(140,000)	0	(140,000)	0
Net gains		98,000	213,000	294,000	321,000
Investment securities pledged as collateral	189,900,000			189,900,000		193,300,000
Amortized Cost [Abstract]
Due in one year or less	10,605,000			10,605,000
Due after one year through five years	93,632,000			93,632,000
Due after five years through ten years	84,743,000			84,743,000
Due after ten years	116,216,000			116,216,000
Total	305,196,000			305,196,000
Fair Value [Abstract]
Due in one year or less	10,697,000			10,697,000
Due after one year through five years	93,674,000			93,674,000
Due after five years through ten years	83,978,000			83,978,000
Due after ten years	118,025,000			118,025,000
Total	306,374,000			306,374,000
U.S. Agency Securities [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	138,674,000			138,674,000		125,125,000
Gross Unrealized Gains	875,000			875,000		2,150,000
Gross Unrealized Losses	(1,669,000)			(1,669,000)		(41,000)
Fair Value	137,880,000			137,880,000		127,234,000
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	79,007,000			79,007,000		6,016,000
Twelve Months or Greater, Fair Value	0			0		0
Total, Fair Value	79,007,000			79,007,000		6,016,000
Less than Twelve Months, Gross Unrealized Losses	(1,669,000)			(1,669,000)		(41,000)
Twelve Months or Greater, Gross Unrealized Losses	0			0		0
Total, Gross Unrealized Losses	(1,669,000)			(1,669,000)		(41,000)
US Treasury Securities [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	11,845,000			11,845,000		4,922,000
Gross Unrealized Gains	0			0		25,000
Gross Unrealized Losses	(374,000)			(374,000)		0
Fair Value	11,471,000			11,471,000		4,947,000
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	11,471,000			11,471,000
Twelve Months or Greater, Fair Value	0			0
Total, Fair Value	11,471,000			11,471,000
Less than Twelve Months, Gross Unrealized Losses	(374,000)			(374,000)
Twelve Months or Greater, Gross Unrealized Losses	0			0
Total, Gross Unrealized Losses	(374,000)			(374,000)
Obligations of State and Political Subdivisions [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	93,203,000			93,203,000		95,288,000
Gross Unrealized Gains	2,939,000			2,939,000		5,721,000
Gross Unrealized Losses	(965,000)			(965,000)		(134,000)
Fair Value	95,177,000			95,177,000		100,875,000
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	19,910,000			19,910,000		7,981,000
Twelve Months or Greater, Fair Value	0			0		0
Total, Fair Value	19,910,000			19,910,000		7,981,000
Less than Twelve Months, Gross Unrealized Losses	(965,000)			(965,000)		(134,000)
Twelve Months or Greater, Gross Unrealized Losses	0			0		0
Total, Gross Unrealized Losses	(965,000)			(965,000)		(134,000)
Corporate Obligations [Member]
Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract]
Amortized Cost	21,161,000			21,161,000		21,699,000
Gross Unrealized Gains	356,000			356,000		452,000
Gross Unrealized Losses	(551,000)			(551,000)		(42,000)
Fair Value	20,966,000			20,966,000		22,109,000
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	12,018,000			12,018,000		10,972,000
Twelve Months or Greater, Fair Value	0			0		0
Total, Fair Value	12,018,000			12,018,000		10,972,000
Less than Twelve Months, Gross Unrealized Losses	(551,000)			(551,000)		(42,000)
Twelve Months or Greater, Gross Unrealized Losses	0			0		0
Total, Gross Unrealized Losses	(551,000)			(551,000)		(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						52,072,000
Gross Unrealized Gains						1,728,000
Gross Unrealized Losses						(127,000)
Fair Value						53,673,000
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than Twelve Months, Fair Value	23,272,000			23,272,000		8,651,000
Twelve Months or Greater, Fair Value	47,000			47,000		0
Total, Fair Value	23,319,000			23,319,000		8,651,000
Less than Twelve Months, Gross Unrealized Losses	(266,000)			(266,000)		(127,000)
Twelve Months or Greater, Gross Unrealized Losses	(11,000)			(11,000)		0
Total, Gross Unrealized Losses	(277,000)			(277,000)		(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	832,000			832,000		912,000
Gross Unrealized Gains	729,000			729,000		502,000
Gross Unrealized Losses	0			0		0
Fair Value	$ 1,561,000			$ 1,561,000		$ 1,414,000