Investment Securities (Details 2) (USD $)	6 Months Ended
	Jun. 30, 2012 investment	Dec. 31, 2011
Fair Value
Less than 12 Months	$ 52,028,000	$ 54,521,000
12 months or Longer	28,071,000	26,831,000
Total	80,099,000	81,352,000
Unrealized Losses
Less than 12 Months	(302,000)	(695,000)
12 months or Longer	(744,000)	(885,000)
Total	(1,046,000)	(1,580,000)
Investment securities pledged as collateral	241,920,000	250,360,000
U.S. Treasury and Federal agencies securities
Fair Value
Less than 12 Months	35,531,000	42,536,000
Total	35,531,000	42,536,000
Unrealized Losses
Less than 12 Months	(129,000)	(50,000)
Total	(129,000)	(50,000)
U.S. States and political subdivisions securities
Fair Value
Less than 12 Months	7,948,000	423,000
12 months or Longer	3,321,000	5,149,000
Total	11,269,000	5,572,000
Unrealized Losses
Less than 12 Months	(82,000)	(9,000)
12 months or Longer	(479,000)	(651,000)
Total	(561,000)	(660,000)
Mortgage-backed securities - Federal agencies
Fair Value
Less than 12 Months	3,511,000	5,071,000
12 months or Longer	16,279,000	13,099,000
Total	19,790,000	18,170,000
Unrealized Losses
Less than 12 Months	(27,000)	(1,000)
12 months or Longer	(11,000)	(8,000)
Total	(38,000)	(9,000)
Corporate debt securities
Fair Value
Less than 12 Months	4,938,000	4,858,000
12 months or Longer	8,467,000	8,579,000
Total	13,405,000	13,437,000
Unrealized Losses
Less than 12 Months	(63,000)	(142,000)
12 months or Longer	(251,000)	(222,000)
Total	(314,000)	(364,000)
Foreign government and other securities
Fair Value
Less than 12 Months	99,000	1,011,000
Total	99,000	1,011,000
Unrealized Losses
Less than 12 Months	(1,000)	(1,000)
Total	(1,000)	(1,000)
Total debt securities
Fair Value
Less than 12 Months	52,027,000	53,899,000
12 months or Longer	28,067,000	26,827,000
Total	80,094,000	80,726,000
Unrealized Losses
Less than 12 Months	(302,000)	(203,000)
12 months or Longer	(741,000)	(881,000)
Total	(1,043,000)	(1,084,000)
Marketable equity securities
Fair Value
Less than 12 Months	1,000	622,000
12 months or Longer	4,000	4,000
Total	5,000	626,000
Unrealized Losses
Less than 12 Months		(492,000)
12 months or Longer	(3,000)	(4,000)
Total	$ (3,000)	$ (496,000)
Number of common stock investments related to unrealized losses	1