Loans and Leases - Schedule Of Credit Quality Indicator Loan Class and Year of Origination the Amortized Cost Basis of Loans And Leases (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	$ 42,291,759
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	38,816,028
Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	3,475,731
Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	38,335,863
Pass | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	3,412,841
Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	373,270
Special Mention | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	22,176
Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	106,895
Substandard | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	40,714
2020
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	2,049,371
2020 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	1,810,786
2020 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	238,585
2020 | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	1,810,786
2020 | Pass | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	237,490
2020 | Substandard | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	1,095
2019
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	8,065,512
2019 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	7,081,366
2019 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	984,146
2019 | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	7,073,176
2019 | Pass | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	975,096
2019 | Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	8,190
2019 | Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	0
2019 | Substandard | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	9,050
2018
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	7,468,322
2018 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	7,234,525
2018 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	233,797
2018 | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	7,192,253
2018 | Pass | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	229,159
2018 | Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	37,739
2018 | Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	4,533
2018 | Substandard | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	4,638
2017
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	5,811,402
2017 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	5,543,228
2017 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	268,174
2017 | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	5,482,863
2017 | Pass | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	251,133
2017 | Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	59,749
2017 | Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	616
2017 | Substandard | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	17,041
2016
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	4,666,162
2016 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	4,487,675
2016 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	178,487
2016 | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	4,316,731
2016 | Pass | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	174,287
2016 | Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	145,622
2016 | Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	25,322
2016 | Substandard | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	4,200
Loans And Lease Receivable Amortized Cost Basis
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	12,800,945
Loans And Lease Receivable Amortized Cost Basis | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	12,632,388
Loans And Lease Receivable Amortized Cost Basis | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	168,557
Loans And Lease Receivable Amortized Cost Basis | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	12,434,784
Loans And Lease Receivable Amortized Cost Basis | Pass | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	164,021
Loans And Lease Receivable Amortized Cost Basis | Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	121,180
Loans And Lease Receivable Amortized Cost Basis | Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	76,424
Loans And Lease Receivable Amortized Cost Basis | Substandard | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	4,536
Revolving Loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	1,430,045
Revolving Loans | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	26,060
Revolving Loans | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	1,403,985
Revolving Loans | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	25,270
Revolving Loans | Pass | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	1,381,655
Revolving Loans | Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	790
Revolving Loans | Special Mention | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	22,176
Revolving Loans | Substandard | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans And Lease Receivable Amortized Cost Basis	$ 154