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Acquisition of Clifton Bancorp Inc. - Additional Information (Detail) - USD ($) $ in Thousands | Apr. 02, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Business Acquisition [Line Items] |  |  |  |  |  |  |
Stockholders' equity |  | $ 1,158,111 | $ 1,183,261 | $ 1,268,748 | $ 991,201 | $ 989,273 | $ 1,057,181
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 |  |  |  |  |  |

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