Securities, Temporarily impaired securities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Temporarily impaired securities with gross unrealized losses and fair value [Abstract]
Less Than 12 Months, Fair Value	$ 13,752	$ 14,673
Less Than 12 Months, Unrealized Loss	135	136
Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	2,266	1,123
12 Months or More, Unrealized Loss	209	188
Number of temporarily impaired securities	24
Fair Value of temporarily impaired securities	16,018
Unrealized loss on securities	344
Number of securities that were temporarily impaired in a continuous loss position for twelve months or more	4
U.S. Government agencies and corporations [Member]
Temporarily impaired securities with gross unrealized losses and fair value [Abstract]
Less Than 12 Months, Fair Value	2,988	6,230
Less Than 12 Months, Unrealized Loss	12	20
Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	0	0
12 Months or More, Unrealized Loss	0	0
States and political subdivisions [Member]
Temporarily impaired securities with gross unrealized losses and fair value [Abstract]
Less Than 12 Months, Fair Value	10,764	3,527
Less Than 12 Months, Unrealized Loss	123	19
Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	170	981
12 Months or More, Unrealized Loss	0	26
Corporate debt securities [Member]
Temporarily impaired securities with gross unrealized losses and fair value [Abstract]
Less Than 12 Months, Fair Value	0	4,916
Less Than 12 Months, Unrealized Loss	0	97
Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	1,963	0
12 Months or More, Unrealized Loss	37	0
Other [Member]
Temporarily impaired securities with gross unrealized losses and fair value [Abstract]
Less Than 12 Months, Fair Value	0	0
Less Than 12 Months, Unrealized Loss	0	0
Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	133	142
12 Months or More, Unrealized Loss	$ 172	$ 162