Loans Receivable and Allowance for Credit Losses (Summary of Aging Loans Receivable by Portfolio Segment and Class) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 82,084	$ 87,090
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	104,177	125,100
Current	9,715,466	9,714,758
Total loans	9,819,643	9,839,858
Non-accrual loans with no related allowance	67,339	49,013
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	13,244	22,762
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	8,849	15,248
Mortgage Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	43,032	42,689
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	62,864	68,995
Current	6,882,423	6,710,827
Total loans	6,945,287	6,779,822
Non-accrual loans with no related allowance	43,032	31,189
Mortgage Portfolio Segment \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	7,797	9,315
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	20,820	33,956
Current	1,256,556	1,260,746
Total loans	1,277,376	1,294,702
Non-accrual loans with no related allowance	7,797	9,315
Mortgage Portfolio Segment \| Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	33,742	31,982
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	36,445	32,856
Current	3,557,567	3,425,810
Total loans	3,594,012	3,458,666
Non-accrual loans with no related allowance	33,742	20,482
Mortgage Portfolio Segment \| Multi-Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	101	0
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	1,428	791
Current	1,456,765	1,483,724
Total loans	1,458,193	1,484,515
Non-accrual loans with no related allowance	101	0
Mortgage Portfolio Segment \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,392	1,392
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	4,171	1,392
Current	611,535	540,547
Total loans	615,706	541,939
Non-accrual loans with no related allowance	1,392	1,392
Mortgage Portfolio Segment \| Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	11,495	16,756
Mortgage Portfolio Segment \| Financing Receivables, 30 to 59 Days Past Due \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	6,862	15,789
Mortgage Portfolio Segment \| Financing Receivables, 30 to 59 Days Past Due \| Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	2,183	761
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	1,327	206
Mortgage Portfolio Segment \| Financing Receivables, 30 to 59 Days Past Due \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	1,123	0
Mortgage Portfolio Segment \| Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	8,337	9,550
Mortgage Portfolio Segment \| Financing Receivables, 60 to 89 Days Past Due \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	6,161	8,852
Mortgage Portfolio Segment \| Financing Receivables, 60 to 89 Days Past Due \| Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	520	113
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	585
Mortgage Portfolio Segment \| Financing Receivables, 60 to 89 Days Past Due \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	1,656	0
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	36,042	42,118
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	36,670	44,955
Current	2,474,038	2,522,515
Total loans	2,510,708	2,567,470
Non-accrual loans with no related allowance	21,298	15,541
Commercial Loans \| Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	393	1,658
Commercial Loans \| Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	235	1,179
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	3,010	2,283
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	4,643	11,150
Current	359,005	481,416
Total loans	363,648	492,566
Non-accrual loans with no related allowance	3,009	2,283
Consumer Loans \| Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	1,356	4,348
Consumer Loans \| Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	$ 277	$ 4,519

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Amount, before allowance for credit loss and fee, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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