Investment Securities - Unrealized Loss Position (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	$ 62,697	$ 65,922
Less than Twelve Months Unrealized Losses	(300)	(820)
Twelve Months or Longer Fair value	480	5,308
Twelve Months or Longer Unrealized Losses	(12)	(680)
Total Fair Value	63,177	71,230
Total gross unrealized loss	(312)	(1,500)
U.S. treasuries [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	4,938
Less than Twelve Months Unrealized Losses	(22)
Total Fair Value	4,938
Total gross unrealized loss	(22)
U.S. government corporations and agencies [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	36,793	24,967
Less than Twelve Months Unrealized Losses	(75)	(33)
Total Fair Value	36,793	24,967
Total gross unrealized loss	(75)	(33)
State and political subdivisions [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	4,574
Less than Twelve Months Unrealized Losses	(14)
Twelve Months or Longer Fair value	480	1,997
Twelve Months or Longer Unrealized Losses	(12)	(20)
Total Fair Value	5,054	1,997
Total gross unrealized loss	(26)	(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)
Commercial mortgage obligations [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	5,006
Less than Twelve Months Unrealized Losses	(5)
Total Fair Value	5,006
Total gross unrealized loss	(5)
Corporate bonds [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	10,410	34,851
Less than Twelve Months Unrealized Losses	(51)	(543)
Total Fair Value	10,410	34,851
Total gross unrealized loss	(51)	(543)
Equity securities [Member]
Amount of securities that were in an unrealized loss position
Less than Twelve Months Fair Value	976	920
Less than Twelve Months Unrealized Losses	(133)	(224)
Total Fair Value	976	920
Total gross unrealized loss	$ (133)	$ (224)