Loans Receivable and Allowance for Credit Losses (Summary of Aging Loans Receivable by Portfolio Segment and Class) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 48,953	$ 40,194
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	90,363	52,769
Current	9,684,230	7,284,795
Total gross loans	9,774,593	7,337,564
Non-accrual loans with no related allowance	11,694	6,796
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	26,349	9,564
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	15,061	3,011
Mortgage Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	26,143	13,813
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	59,422	22,297
Current	7,018,524	5,289,148
Total gross loans	7,077,946	5,311,445
Non-accrual loans with no related allowance	5,625	2,989
Mortgage Portfolio Segment \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	9,424	8,543
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	25,358	17,027
Current	1,294,864	1,060,662
Total gross loans	1,320,222	1,077,689
Non-accrual loans with no related allowance	1,491	2,989
Mortgage Portfolio Segment \| Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	16,568	5,270
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	25,111	5,270
Current	3,725,528	2,573,123
Total gross loans	3,750,639	2,578,393
Non-accrual loans with no related allowance	4,134	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	488	0
Current	1,544,436	1,225,551
Total gross loans	1,544,924	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	151	0
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	8,465	0
Current	453,696	429,812
Total gross loans	462,161	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	20,029	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	8,719	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	3,914	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	7,396	0
Mortgage Portfolio Segment \| Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	13,250	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	7,215	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	4,629	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	488	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	918	0
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	21,269	25,160
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	27,793	27,638
Current	2,262,403	1,607,121
Total gross loans	2,290,196	1,634,759
Non-accrual loans with no related allowance	6,060	3,238
Commercial Loans \| Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	5,575	2,383
Commercial Loans \| Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	949	95
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,541	1,221
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	3,148	2,834
Current	403,303	388,526
Total gross loans	406,451	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	745	1,276
Consumer Loans \| Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	$ 862	$ 337

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