Investment Securities (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Investment securities
Less Than Twelve Months, Fair Value	$ 80,837,000		$ 109,937,000
Less Than Twelve Months, Unrealized Loss	(738,000)		(942,000)
Twelve Months or More, Fair Value	43,000		763,000
Twelve Months or More, Unrealized Loss	(2,000)		(172,000)
Total, Fair Value	80,880,000		110,700,000
Total, Unrealized Loss	(740,000)		(1,114,000)
Proceeds from the sales and calls of securities and the associated gains and losses
Proceeds	89,245,000	12,482,000
Gross gains	4,204,000	303,000
Gross losses	(618,000)
Income tax expenses related to net realized gains on sales and calls of securities	1,500,000	100,000
Available for sale securities
One Year Or Less	27,351,000
Over 1 Through 5 Years	83,239,000
Over 5 Years Through 10 Years	66,116,000
Over 10 Years	71,184,000
Total	247,890,000
Available for sale securities, Amortized cost
One Year Or Less	27,131,000
Over 1 Through 5 Years	81,768,000
Over 5 Years Through 10 Years	65,222,000
Over 10 Years	71,170,000
Total	245,291,000		281,012,000
Weighted average yield
One Year Or Less (as a percent)	2.34%
Over 1 Through 5 Years (as a percent)	2.63%
Over 5 Years Through 10 Years (as a percent)	2.34%
Over 10 Years (as a percent)	2.68%
Total (as a percent)	2.54%
Earnings on both taxable and tax-exempt investment securities
Total	1,433,000	1,798,000
Obligations of U.S. government agencies
Investment securities
Twelve Months or More, Fair Value	43,000		44,000
Twelve Months or More, Unrealized Loss	(2,000)		(2,000)
Total, Fair Value	43,000		44,000
Total, Unrealized Loss	(2,000)		(2,000)
Available for sale securities
One Year Or Less	91,000
Over 1 Through 5 Years	400,000
Over 5 Years Through 10 Years	1,860,000
Over 10 Years	2,485,000
Total	4,836,000
Available for sale securities, Amortized cost
Total	4,781,000		7,307,000
Earnings on both taxable and tax-exempt investment securities
Taxable earnings on investment securities	31,000	25,000
Mortgage backed securities
Earnings on both taxable and tax-exempt investment securities
Taxable earnings on investment securities	830,000	1,057,000
Mortgage-backed securities - U.S. government sponsored entities and agencies
Investment securities
Less Than Twelve Months, Fair Value	62,409,000		83,092,000
Less Than Twelve Months, Unrealized Loss	(581,000)		(798,000)
Total, Fair Value	62,409,000		83,092,000
Total, Unrealized Loss	(581,000)		(798,000)
Available for sale securities
One Year Or Less	21,152,000
Over 1 Through 5 Years	54,941,000
Over 5 Years Through 10 Years	32,691,000
Over 10 Years	47,009,000
Total	155,793,000
Available for sale securities, Amortized cost
Total	155,391,000		145,430,000
Mortgage-backed securities - U.S. government sponsored entities and agencies | Maximum
Securities in an unrealized loss position
Maturity period of other than temporary impairment securities	40 years
Mortgage-backed securities - U.S. government sponsored entities and agencies | Minimum
Securities in an unrealized loss position
Maturity period of other than temporary impairment securities	1 year
Mortgage-backed securities - Non-agency
Investment securities
Less Than Twelve Months, Fair Value	2,871,000		7,204,000
Less Than Twelve Months, Unrealized Loss	(15,000)		(15,000)
Twelve Months or More, Fair Value			719,000
Twelve Months or More, Unrealized Loss			(170,000)
Total, Fair Value	2,871,000		7,923,000
Total, Unrealized Loss	(15,000)		(185,000)
Available for sale securities
One Year Or Less	6,108,000
Over 1 Through 5 Years	14,674,000
Over 5 Years Through 10 Years	1,617,000
Over 10 Years	1,527,000
Total	23,926,000
Available for sale securities, Amortized cost
Total	23,209,000		43,402,000
State and municipal securities
Investment securities
Less Than Twelve Months, Fair Value	5,754,000		9,813,000
Less Than Twelve Months, Unrealized Loss	(88,000)		(96,000)
Total, Fair Value	5,754,000		9,813,000
Total, Unrealized Loss	(88,000)		(96,000)
Available for sale securities
Over 1 Through 5 Years	7,778,000
Over 5 Years Through 10 Years	19,213,000
Over 10 Years	4,013,000
Total	31,004,000
Available for sale securities, Amortized cost
Total	29,923,000		64,824,000
Earnings on both taxable and tax-exempt investment securities
Taxable earnings on investment securities	5,000	103,000
Non-taxable earnings on investment securities	455,000	412,000
Corporate debt securities
Earnings on both taxable and tax-exempt investment securities
Taxable earnings on investment securities		176,000
Asset backed securities
Investment securities
Less Than Twelve Months, Fair Value	9,803,000		9,828,000
Less Than Twelve Months, Unrealized Loss	(54,000)		(33,000)
Total, Fair Value	9,803,000		9,828,000
Total, Unrealized Loss	(54,000)		(33,000)
Available for sale securities
Over 1 Through 5 Years	5,446,000
Over 5 Years Through 10 Years	10,735,000
Over 10 Years	16,150,000
Total	32,331,000
Available for sale securities, Amortized cost
Total	31,987,000		20,049,000
Earnings on both taxable and tax-exempt investment securities
Taxable earnings on investment securities	112,000	25,000
Securities pledged to secure public deposits
Available for sale securities
Total	7,700,000		9,000,000
Available for sale securities, Amortized cost
Total	$ 7,500,000		$ 8,700,000