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Loans Receivable and Allowance for Loan Losses - Summary of Loans Receivable by Credit Quality Risk Rating Indicator (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 9,822,890 $ 7,332,885
Total gross loans 9,839,858 7,337,564
Total gross loans 9,839,858  
2020 2,164,207  
2019 1,593,812  
2018 1,198,663  
2017 1,102,016  
2016 and prior 4,137,717  
Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 605,963 218,056
2020 4,380  
2019 67,551  
2018 84,109  
2017 93,366  
2016 and prior 356,557  
Criticized and classified loans, gross 207,400  
Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 340,617 128,694
2020 3,465  
2019 52,586  
2018 68,268  
2017 53,276  
2016 and prior 163,022  
Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 265,294 88,526
2020 915  
2019 14,965  
2018 15,841  
2017 40,090  
2016 and prior 193,483  
Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 52 836
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 52  
Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 9,233,895 7,119,508
2020 2,159,827  
2019 1,526,261  
2018 1,114,554  
2017 1,008,650  
2016 and prior 3,781,160  
Mortgage loans    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 6,779,822 5,311,445
Total gross loans 6,779,822 5,311,445
2020 1,313,601  
2019 1,231,931  
2018 888,270  
2017 802,284  
2016 and prior 2,682,925  
Mortgage loans | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 313,126 79,003
2020 2,155  
2019 50,783  
2018 71,113  
2017 49,886  
2016 and prior 139,189  
Mortgage loans | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 181,670 49,160
2020 1,991  
2019 45,503  
2018 61,448  
2017 25,955  
2016 and prior 46,773  
Mortgage loans | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 131,456 29,843
2020 164  
2019 5,280  
2018 9,665  
2017 23,931  
2016 and prior 92,416  
Mortgage loans | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage loans | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage loans | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 6,466,696 5,232,442
2020 1,311,446  
2019 1,181,148  
2018 817,157  
2017 752,398  
2016 and prior 2,543,736  
Mortgage loans | Residential    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,294,702 1,077,689
Total gross loans 1,294,702  
2020 272,022  
2019 155,492  
2018 95,257  
2017 104,164  
2016 and prior 689,871  
Mortgage loans | Residential | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 29,533 12,606
2020 164  
2019 3,375  
2018 1,669  
2017 2,221  
2016 and prior 22,104  
Mortgage loans | Residential | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,882 2,402
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 2,882  
Mortgage loans | Residential | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 26,651 10,204
2020 164  
2019 3,375  
2018 1,669  
2017 2,221  
2016 and prior 19,222  
Mortgage loans | Residential | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage loans | Residential | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage loans | Residential | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,265,169 1,065,083
2020 271,858  
2019 152,117  
2018 93,588  
2017 101,943  
2016 and prior 667,767  
Mortgage loans | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 3,458,666 2,578,393
Total gross loans 3,458,666  
2020 653,276  
2019 644,912  
2018 433,620  
2017 480,896  
2016 and prior 1,355,622  
Mortgage loans | Commercial | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 222,944 60,216
2020 0  
2019 32,218  
2018 37,133  
2017 43,933  
2016 and prior 109,660  
Mortgage loans | Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 124,631 46,758
2020 0  
2019 30,313  
2018 33,446  
2017 22,838  
2016 and prior 38,034  
Mortgage loans | Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 98,313 13,458
2020 0  
2019 1,905  
2018 3,687  
2017 21,095  
2016 and prior 71,626  
Mortgage loans | Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage loans | Commercial | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage loans | Commercial | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,235,722 2,518,177
2020 653,276  
2019 612,694  
2018 396,487  
2017 436,963  
2016 and prior 1,245,962  
Mortgage loans | Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,484,515 1,225,551
Total gross loans 1,484,515  
2020 293,188  
2019 180,998  
2018 209,017  
2017 173,385  
2016 and prior 635,352  
Mortgage loans | Multi-family | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 31,349 0
2020 0  
2019 682  
2018 20,125  
2017 3,117  
2016 and prior 7,425  
Mortgage loans | Multi-family | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 29,781 0
2020 0  
2019 682  
2018 20,125  
2017 3,117  
2016 and prior 5,857  
Mortgage loans | Multi-family | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,568 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 1,568  
Mortgage loans | Multi-family | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage loans | Multi-family | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage loans | Multi-family | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,453,166 1,225,551
2020 293,188  
2019 180,316  
2018 188,892  
2017 170,268  
2016 and prior 627,927  
Mortgage loans | Construction    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 541,939 429,812
Total gross loans 541,939  
2020 95,115  
2019 250,529  
2018 150,376  
2017 43,839  
2016 and prior 2,080  
Mortgage loans | Construction | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 29,300 6,181
2020 1,991  
2019 14,508  
2018 12,186  
2017 615  
2016 and prior 0  
Mortgage loans | Construction | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 24,376 0
2020 1,991  
2019 14,508  
2018 7,877  
2017 0  
2016 and prior 0  
Mortgage loans | Construction | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 4,924 6,181
2020 0  
2019 0  
2018 4,309  
2017 615  
2016 and prior 0  
Mortgage loans | Construction | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage loans | Construction | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage loans | Construction | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 512,639 423,631
2020 93,124  
2019 236,021  
2018 138,190  
2017 43,224  
2016 and prior 2,080  
Commercial loans    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 2,567,470 1,634,759
Total gross loans 2,567,470 1,634,759
2020 787,865  
2019 291,810  
2018 245,856  
2017 243,894  
2016 and prior 1,207,649  
Commercial loans | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 284,224 137,099
2020 2,200  
2019 16,400  
2018 12,610  
2017 43,410  
2016 and prior 209,604  
Commercial loans | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 157,080 79,248
2020 1,474  
2019 7,080  
2018 6,544  
2017 27,251  
2016 and prior 114,731  
Commercial loans | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 127,092 57,015
2020 726  
2019 9,320  
2018 6,066  
2017 16,159  
2016 and prior 94,821  
Commercial loans | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 52 836
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 52  
Commercial loans | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Commercial loans | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,283,246 1,497,660
2020 785,665  
2019 275,410  
2018 233,246  
2017 200,484  
2016 and prior 998,045  
Consumer loans    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 492,566 391,360
Total gross loans 492,566  
2020 62,741  
2019 70,071  
2018 64,537  
2017 55,838  
2016 and prior 247,143  
Consumer loans | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 8,613 1,954
2020 25  
2019 368  
2018 386  
2017 70  
2016 and prior 7,764  
Consumer loans | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,867 286
2020 0  
2019 3  
2018 276  
2017 70  
2016 and prior 1,518  
Consumer loans | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 6,746 1,668
2020 25  
2019 365  
2018 110  
2017 0  
2016 and prior 6,246  
Consumer loans | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Consumer loans | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Consumer loans | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 483,953 $ 389,406
2020 62,716  
2019 69,703  
2018 64,151  
2017 55,768  
2016 and prior $ 239,379