Investment Securities - Unrealized Loss Position (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	$ 18,196	$ 65,922
Less than Twelve Months Unrealized Losses	(146)	(820)
Twelve Months or Longer Fair value	1,727	5,308
Twelve Months or Longer Unrealized Losses	(328)	(680)
Total Fair Value	19,923	71,230
Total gross unrealized loss	(474)	(1,500)
U.S government corporations and agencies [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value		24,967
Less than Twelve Months Unrealized Losses		(33)
Twelve Months or Longer Fair value
Twelve Months or Longer Unrealized Losses
Total Fair Value		24,967
Total gross unrealized loss		(33)
State and political subdivisions [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	8,183
Less than Twelve Months Unrealized Losses	(90)
Twelve Months or Longer Fair value	958	1,997
Twelve Months or Longer Unrealized Losses	(17)	(20)
Total Fair Value	9,141	1,997
Total gross unrealized loss	(107)	(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	9,990	34,851
Less than Twelve Months Unrealized Losses	(53)	(543)
Twelve Months or Longer Fair value
Twelve Months or Longer Unrealized Losses
Total Fair Value	9,990	34,851
Total gross unrealized loss	(53)	(543)
Equity securities [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	23	920
Less than Twelve Months Unrealized Losses	(3)	(224)
Twelve Months or Longer Fair value	769
Twelve Months or Longer Unrealized Losses	(311)
Total Fair Value	792	920
Total gross unrealized loss	$ (314)	$ (224)