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Loans Receivable and Allowance for Credit Losses (Summary of Aging Loans Receivable by Portfolio Segment and Class) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 35,467 $ 40,194
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 47,435 52,769
Current 7,732,832 7,284,795
Total gross loans 7,780,267 7,337,564
Non-accrual loans with no related allowance 9,681 6,796
Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 6,689 9,564
Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 5,279 3,011
Mortgage Portfolio Segment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 11,854 13,813
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 21,419 22,297
Current 5,340,982 5,289,148
Total gross loans 5,362,401 5,311,445
Non-accrual loans with no related allowance 1,606 2,989
Mortgage Portfolio Segment | Residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 6,806 8,543
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 16,371 17,027
Current 1,109,036 1,060,662
Total gross loans 1,125,407 1,077,689
Non-accrual loans with no related allowance 1,606 2,989
Mortgage Portfolio Segment | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 5,048 5,270
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 5,048 5,270
Current 2,671,378 2,573,123
Total gross loans 2,676,426 2,578,393
Non-accrual loans with no related allowance 0 0
Mortgage Portfolio Segment | Multi-Family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 0 0
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 0 0
Current 1,275,588 1,225,551
Total gross loans 1,275,588 1,225,551
Non-accrual loans with no related allowance 0 0
Mortgage Portfolio Segment | Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 0 0
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 0 0
Current 284,980 429,812
Total gross loans 284,980 429,812
Non-accrual loans with no related allowance 0 0
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 4,895 5,905
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 4,895 5,905
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 0 0
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Multi-Family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 0 0
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 0 0
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 4,670 2,579
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 4,670 2,579
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 0 0
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Multi-Family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 0 0
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 0 0
Commercial Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 22,419 25,160
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 22,894 27,638
Current 2,033,319 1,607,121
Total gross loans 2,056,213 1,634,759
Non-accrual loans with no related allowance 8,066 3,238
Commercial Loans | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 456 2,383
Commercial Loans | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 19 95
Consumer Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,194 1,221
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 3,122 2,834
Current 358,531 388,526
Total gross loans 361,653 391,360
Non-accrual loans with no related allowance 9 569
Consumer Loans | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 1,338 1,276
Consumer Loans | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due $ 590 $ 337