Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Allowance for loan losses (in dollars)	$ 4,603	$ 4,828
Stockholders' Equity:
Treasury stock, shares	2,617,826	103,991
Preferred stock
Stockholders' Equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common Stock
Stockholders' Equity:
Common stock, shares issued	30,039,043	29,180,699
Common stock, shares outstanding	27,421,217	29,076,708
Common Stock | Voting common stock
Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	21,282,647	21,509,179
Common stock, shares outstanding	18,664,821	21,405,188
Common Stock | Non-voting common stock
Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	8,756,396	7,671,520
Common stock, shares outstanding	8,756,396	7,671,520