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Loans Receivable and Allowance for Credit Losses on Loans (Summary of Aging Loans Receivable by Portfolio Segment and Class) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 35,339 $ 40,194
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 62,240 52,769
Current 7,314,044 7,284,795
Total gross loans 7,376,284 7,337,564
Non-accrual loans with no related allowance 3,530 6,796
Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 22,164 9,564
Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 4,737 3,011
Mortgage Portfolio Segment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 11,409 13,813
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 22,148 22,297
Current 5,270,870 5,289,148
Total gross loans 5,293,018 5,311,445
Non-accrual loans with no related allowance 1,522 2,989
Mortgage Portfolio Segment | Residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 6,145 8,543
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 16,460 17,027
Current 1,090,210 1,060,662
Total gross loans 1,106,670 1,077,689
Non-accrual loans with no related allowance 1,522 2,989
Mortgage Portfolio Segment | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 5,264 5,270
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 5,688 5,270
Current 2,549,403 2,573,123
Total gross loans 2,555,091 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 1,222,313 1,225,551
Total gross loans 1,222,313 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 408,944 429,812
Total gross loans 408,944 429,812
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 6,664 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 6,240 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 424 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 4,075 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 4,075 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 23,086 25,160
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 36,880 27,638
Current 1,666,789 1,607,121
Total gross loans 1,703,669 1,634,759
Non-accrual loans with no related allowance 1,344 3,238
Commercial Loans | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 13,793 2,383
Commercial Loans | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 1 95
Consumer Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 844 1,221
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 3,212 2,834
Current 376,385 388,526
Total gross loans 379,597 391,360
Non-accrual loans with no related allowance 664 569
Consumer Loans | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 1,707 1,276
Consumer Loans | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due $ 661 $ 337