Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Time certificates of deposit least amount	$ 100,000	$ 100,000
Held to Maturity, Fair Value, Total	$ 455,776,000	$ 379,699,000
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	1,000,000	1,000,000
Preferred Stock, shares outstanding	0	0
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	75,000,000	75,000,000
Common Stock, shares issued	26,212,238	23,998,738
Common Stock, shares outstanding	26,212,238	23,998,738
Common Stock, unvested restricted Stock awards	244,510	254,500
Shares Held in Rabbi Trust	172,214	176,849