Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Time certificates of deposit least amount	$ 100,000
Securities Held to Maturity, fair value	$ 215,410,000	$ 185,824,000
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	1,000,000	1,000,000
Preferred Stock, shares outstanding
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	75,000,000	75,000,000
Common Stock, shares issued	22,871,347	22,774,009
Common Stock, shares outstanding	22,871,347	22,774,009
Common Stock, unvested restricted Stock awards	295,690	264,124
Shares Held in Rabbi Trust	174,325	179,814