Investment Securities (Details 3) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013 item	Dec. 31, 2012 item
Fair Value
Less than 12 months	$ 105,976,000	$ 7,887,000
12 months or more	790,000	150,000
Total	106,766,000	8,037,000
Unrealized Losses
Less than 12 months	(3,175,000)	(28,000)
12 months or more	(8,000)
Total	(3,183,000)	(28,000)
Other disclosure
Number of securities consisted in portfolio	350	380
Number of securities in loss position	100	14
Unrealized loss included in other comprehensive	3,200,000	28,000
Government sponsored enterprises
Fair Value
Less than 12 months	27,876,000	1,044,000
Total	27,876,000	1,044,000
Unrealized Losses
Less than 12 months	(674,000)
Total	(674,000)
Asset-backed securities
Fair Value
Less than 12 months	68,464,000	4,729,000
12 months or more	790,000
Total	69,254,000	4,729,000
Unrealized Losses
Less than 12 months	(2,281,000)	(11,000)
12 months or more	(8,000)
Total	(2,289,000)	(11,000)
Obligations of states and political subdivisions
Fair Value
Less than 12 months	9,636,000	2,114,000
12 months or more		150,000
Total	9,636,000	2,264,000
Unrealized Losses
Less than 12 months	(220,000)	(17,000)
Total	$ (220,000)	$ (17,000)