Investment Securities (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 item	Dec. 31, 2011
Investment Securities
Number of securities with gross unrealized loss	31
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	$ 183	$ 9
Twelve Months or More		31
Securities Available for Sale, Fair Value
Less Than Twelve Months	28,283	12,526
Twelve Months or More		724
State and municipal obligations
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	49	1
Twelve Months or More		31
Securities Available for Sale, Fair Value
Less Than Twelve Months	9,602	420
Twelve Months or More		724
Government-sponsored entities debt
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	31	3
Securities Available for Sale, Fair Value
Less Than Twelve Months	4,963	5,505
Mortgage-backed securities
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	102	5
Securities Available for Sale, Fair Value
Less Than Twelve Months	13,709	6,601
Corporate stocks
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	1
Securities Available for Sale, Fair Value
Less Than Twelve Months	$ 9