CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Held to maturity, Fair Value	$ 109,662	$ 109,644
Allowance for loan losses	$ 17,172	$ 17,712
Preferred stock, par value
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value
Common stock, shares authorized	499,000,000	499,000,000
Common stock, shares issued	54,138,910	54,138,910
Common stock, shares outstanding	46,492,527	47,517,644
Treasury stock, shares	7,646,383	6,621,266