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Loans Receivable and Allowance for Loan Losses - Summary of Aging Loans Receivable by Portfolio Segment and Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 87,090 $ 40,194
90 days or more past due and accruing 0 0
Total  Past Due 125,100 52,769
Current 9,714,758 7,284,795
Total gross loans 9,839,858 7,337,564
Non-accrual loans with no related allowance 49,013 6,796
Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 22,762 9,564
Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 15,248 3,011
Mortgage loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 42,689 13,813
90 days or more past due and accruing 0 0
Total  Past Due 68,995 22,297
Current 6,710,827 5,289,148
Total gross loans 6,779,822 5,311,445
Non-accrual loans with no related allowance 31,189 2,989
Mortgage loans | Residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 9,315 8,543
90 days or more past due and accruing 0 0
Total  Past Due 33,956 17,027
Current 1,260,746 1,060,662
Total gross loans 1,294,702 1,077,689
Non-accrual loans with no related allowance 9,315 2,989
Mortgage loans | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 31,982 5,270
90 days or more past due and accruing 0 0
Total  Past Due 32,856 5,270
Current 3,425,810 2,573,123
Total gross loans 3,458,666 2,578,393
Non-accrual loans with no related allowance 20,482 0
Mortgage loans | Multi-family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 0 0
90 days or more past due and accruing 0 0
Total  Past Due 791 0
Current 1,483,724 1,225,551
Total gross loans 1,484,515 1,225,551
Non-accrual loans with no related allowance 0 0
Mortgage loans | Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,392 0
90 days or more past due and accruing 0 0
Total  Past Due 1,392 0
Current 540,547 429,812
Total gross loans 541,939 429,812
Non-accrual loans with no related allowance 1,392 0
Mortgage loans | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 16,756 5,905
Mortgage loans | Financing Receivables, 30 to 59 Days Past Due | Residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 15,789 5,905
Mortgage loans | Financing Receivables, 30 to 59 Days Past Due | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 761 0
Mortgage loans | Financing Receivables, 30 to 59 Days Past Due | Multi-family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 206 0
Mortgage loans | Financing Receivables, 30 to 59 Days Past Due | Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 0 0
Mortgage loans | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 9,550 2,579
Mortgage loans | Financing Receivables, 60 to 89 Days Past Due | Residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 8,852 2,579
Mortgage loans | Financing Receivables, 60 to 89 Days Past Due | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 113 0
Mortgage loans | Financing Receivables, 60 to 89 Days Past Due | Multi-family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 585 0
Mortgage loans | Financing Receivables, 60 to 89 Days Past Due | Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 0 0
Commercial loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 42,118 25,160
90 days or more past due and accruing 0 0
Total  Past Due 44,955 27,638
Current 2,522,515 1,607,121
Total gross loans 2,567,470 1,634,759
Non-accrual loans with no related allowance 15,541 3,238
Commercial loans | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 1,658 2,383
Commercial loans | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 1,179 95
Consumer loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,283 1,221
90 days or more past due and accruing 0 0
Total  Past Due 11,150 2,834
Current 481,416 388,526
Total gross loans 492,566 391,360
Non-accrual loans with no related allowance 2,283 569
Consumer loans | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 4,348 1,276
Consumer loans | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due $ 4,519 $ 337