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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair value of held to maturity securities (in dollars) $ 0 $ 899,743
Mortgage servicing rights, at fair value (in dollars) 31,852 38,440
Servicing rights, held-for-sale, fair value (in dollars) 29,793  
Acquired with deteriorated credit quality (in dollars) $ 49,333 $ 40,444
Common Stock:    
Treasury stock, shares 1,583,380 4,099,023
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 51,666,725 53,794,322
Common stock, shares outstanding (in shares) 50,083,345 49,695,299
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 508,107 201,922
Common stock, shares outstanding (in shares) 508,107 201,922