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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Sep. 29, 2017
USD ($)
Reporting_unit
Jul. 28, 2017
USD ($)
Dec. 31, 2018
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Significant Accounting Policies [Line Items]              
Cash and cash equivalents, interest-bearing deposits in other financial institutions       $ 2,528,169,000 $ 557,850,000 $ 537,674,000 $ 564,150,000
Cash and cash equivalents, interest-bearing deposits in other financial institutions, Federal Reserve Bank of New York       2,100,000 138,600,000    
Cash and cash equivalents, federal funds sold       3,100,000 6,800,000    
Cash and cash equivalents, outstanding reverse repurchase agreements       250,000,000 250,000,000    
Minimum amount required to be maintained as total reserves with the Federal Reserve Bank of New York       763,400,000 162,100,000    
Mortgage servicing rights asset       2,729,000 228,099,000    
Loans held for sale       35,258,000 409,152,000    
Gain on sale of business       0      
Covered loans   $ 0   0 1,698,133,000    
Allowance for losses on covered loans       0 23,701,000 31,395,000  
Number of reporting units | Reporting_unit 2            
Goodwill impairment losses       0      
Depreciation and amortization       32,803,000 32,811,000 31,497,000  
Bank-owned life insurance       967,173,000 949,026,000    
Bank-owned life insurance income       27,133,000 31,015,000 $ 27,541,000  
Purchase of bank-owned life insurance policy       0 0    
Other real estate owned       $ 16,400,000 $ 28,598,000    
Shares available for grant | shares       7,135,071      
Federal corporate income tax rate       35.00% 35.00% 35.00%  
Freedom Mortgage Corporation              
Significant Accounting Policies [Line Items]              
Mortgage servicing rights asset $ 208,800,000            
Loans held for sale 20,500,000,000     $ 35,300,000 $ 409,200,000    
Gain on sale of business 7,400,000            
Proceeds from sale of business $ 226,600,000            
Cerberus Capital Management, L. P. | One-to-four family              
Significant Accounting Policies [Line Items]              
Gain on sale of business   74,600,000          
Proceeds from sale of business   $ 1,900,000,000          
ASU 2018-02              
Significant Accounting Policies [Line Items]              
Federal corporate income tax rate       35.00%      
Scenario, Forecast              
Significant Accounting Policies [Line Items]              
Federal corporate income tax rate     21.00%        
Scenario, Forecast | ASU 2018-02              
Significant Accounting Policies [Line Items]              
Federal corporate income tax rate     21.00%        
Taxi Medallion Loans              
Significant Accounting Policies [Line Items]              
Other real estate owned       $ 8,200,000 $ 0.0    
Building              
Significant Accounting Policies [Line Items]              
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)         20 years    
Options and Restricted Stock              
Significant Accounting Policies [Line Items]              
Shares available for grant | shares       7,135,071      
Two Thousand Twelve Incentive Plan              
Significant Accounting Policies [Line Items]              
Shares transferred | shares       1,030,673      
Minimum | Furniture and Fixtures              
Significant Accounting Policies [Line Items]              
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)         3 years    
Minimum | Equipment              
Significant Accounting Policies [Line Items]              
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)         3 years    
Maximum | Furniture and Fixtures              
Significant Accounting Policies [Line Items]              
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)         10 years    
Maximum | Equipment              
Significant Accounting Policies [Line Items]              
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)         10 years