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Acquisition of Clifton Bancorp Inc. - Additional Information (Detail) - USD ($)
$ in Thousands
Apr. 02, 2018
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Business Acquisition [Line Items]          
Stockholders' equity   $ 1,110,789 $ 1,127,159 $ 1,235,550 $ 1,268,748
Goodwill   $ 210,895 $ 210,895    
Clifton Bancorp Inc. [Member]          
Business Acquisition [Line Items]          
Closing date Apr. 02, 2018        
Total assets $ 1,610,000        
Net loans receivable 1,120,000        
Securities 326,900        
Total liabilities 1,380,000        
Deposits 949,800        
Borrowings 414,100        
Purchase price of acquisition 333,900        
Stockholders' equity $ 330,700        
Outstanding shares of Clifton common stock exchanged for shares of Company common stock 1.191        
Issuance of shares of common stock to CSBK stockholders in conjunction with merger 25,400,000        
Cash payment for consideration $ 3,200        
Goodwill recorded in merger 102,300        
Goodwill 102,300        
Core deposit intangible $ 6,400