Investment Securities (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	$ 704	$ 183	$ 186
Twelve Months or More			16
Securities Available for Sale, Fair Value
Less Than Twelve Months	82,128	28,283	24,264
Twelve Months or More			495
Government-sponsored entities debt
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	121	31	112
Securities Available for Sale, Fair Value
Less Than Twelve Months	27,852	4,963	15,516
State and municipal obligations
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	391	49	18
Twelve Months or More			15
Securities Available for Sale, Fair Value
Less Than Twelve Months	27,502	9,602	381
Twelve Months or More			486
Mortgage-backed securities
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	191	102	56
Securities Available for Sale, Fair Value
Less Than Twelve Months	26,765	13,709	8,367
Corporate stocks
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	1	1
Twelve Months or More			1
Securities Available for Sale, Fair Value
Less Than Twelve Months	9	9
Twelve Months or More			$ 9