Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Gross unrealized losses and the fair of value investments
Fair Value less than 12 months	$ 33,298	$ 25,016
Unrealized losses less than 12 months	(182)	(167)
Fair value more than 12 months		1,971
Unrealized losses more than 12 months		(27)
Total fair value	33,298	26,987
Total unrealized losses	(182)	(194)
State and municipal [Member]
Gross unrealized losses and the fair of value investments
Fair Value less than 12 months	9,535	1,550
Unrealized losses less than 12 months	(62)	(44)
Fair value more than 12 months		1,948
Unrealized losses more than 12 months		(27)
Total fair value	9,535	3,498
Total unrealized losses	(62)	(71)
Federal agency collateralized mortgage obligations [Member]
Gross unrealized losses and the fair of value investments
Fair Value less than 12 months	19,284
Unrealized losses less than 12 months	(114)
Fair value more than 12 months
Unrealized losses more than 12 months
Total fair value	19,284
Total unrealized losses	(114)
Federal agency mortgage-backed pools [Member]
Gross unrealized losses and the fair of value investments
Fair Value less than 12 months	4,479	23,442
Unrealized losses less than 12 months	(6)	(115)
Fair value more than 12 months		23
Unrealized losses more than 12 months
Total fair value	4,479	23,465
Total unrealized losses	(6)	(115)
Corporate notes [Member]
Gross unrealized losses and the fair of value investments
Fair Value less than 12 months		24
Unrealized losses less than 12 months		(8)
Fair value more than 12 months
Unrealized losses more than 12 months
Total fair value		24
Total unrealized losses		$ (8)