Investment Securities - Unrealized Loss Position (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	$ 20,012	$ 65,922
Less than Twelve Months Unrealized Losses	(77)	(820)
Twelve Months or Longer Fair value	1,504	5,308
Twelve Months or Longer Unrealized Losses	(177)	(680)
Total Fair Value	21,516	71,230
Total gross unrealized loss	(254)	(1,500)
U.S. treasuries [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	4,952
Less than Twelve Months Unrealized Losses	(7)
Twelve Months or Longer Fair value
Twelve Months or Longer Unrealized Losses
Total Fair Value	4,952
Total gross unrealized loss	(7)
U.S. government corporations and agencies [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	4,993	24,967
Less than Twelve Months Unrealized Losses	(7)	(33)
Twelve Months or Longer Fair value
Twelve Months or Longer Unrealized Losses
Total Fair Value	4,993	24,967
Total gross unrealized loss	(7)	(33)
State and political subdivisions [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	5,057
Less than Twelve Months Unrealized Losses	(24)
Twelve Months or Longer Fair value	587	1,997
Twelve Months or Longer Unrealized Losses	(13)	(20)
Total Fair Value	5,644	1,997
Total gross unrealized loss	(37)	(20)
Residential mortgage-backed securities [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value		5,184
Less than Twelve Months Unrealized Losses		(20)
Twelve Months or Longer Fair value		3,311
Twelve Months or Longer Unrealized Losses		(660)
Total Fair Value		8,495
Total gross unrealized loss		(680)
Corporate bonds [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	4,986	34,851
Less than Twelve Months Unrealized Losses	(38)	(543)
Twelve Months or Longer Fair value
Twelve Months or Longer Unrealized Losses
Total Fair Value	4,986	34,851
Total gross unrealized loss	(38)	(543)
Equity securities [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	24	920
Less than Twelve Months Unrealized Losses	(1)	(224)
Twelve Months or Longer Fair value	917
Twelve Months or Longer Unrealized Losses	(164)
Total Fair Value	941	920
Total gross unrealized loss	$ (165)	$ (224)