Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair value of held to maturity securities (in dollars)	$ 899,743	$ 932,285
Acquired with deteriorated credit quality (in dollars)	40,444	35,533
Mortgage servicing rights, at fair value (in dollars)	$ 76,121	$ 49,939
Common Stock:
Treasury stock, shares	4,099,023	1,599,023
Class A Common Stock
Common Stock:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in dollars per share)	446,863,844	446,863,844
Common stock, shares issued	53,794,322	39,601,290
Common stock, shares outstanding	49,695,299	38,002,267
Class B Common Stock
Common Stock:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in dollars per share)	3,136,156	3,136,156
Common stock, shares issued	201,922	37,355
Common stock, shares outstanding	201,922	37,355