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	Sep. 30, 2020 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	$ 42,829,219
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	39,372,531
Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	3,456,688
2020
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	7,478,724
2020 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	6,574,686
2020 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	904,038
2019
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	7,870,107
2019 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	7,041,020
2019 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	829,087
2018
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	6,833,784
2018 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	6,641,307
2018 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	192,477
2017
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	5,322,152
2017 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	5,086,639
2017 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	235,513
2016
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	4,304,865
2016 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	4,171,927
2016 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	132,938
Prior to 2016
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	9,987,716
Prior to 2016 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	9,832,248
Prior to 2016 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	155,468
Revolving Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	1,031,871
Revolving Loans | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	24,704
Revolving Loans | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	1,007,167
Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	38,050,932
Pass | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	3,392,586
Pass | 2020 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	6,574,686
Pass | 2020 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	900,386
Pass | 2019 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	6,824,784
Pass | 2019 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	820,707
Pass | 2018 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	6,493,565
Pass | 2018 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	188,768
Pass | 2017 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	4,807,008
Pass | 2017 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	221,595
Pass | 2016 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	3,823,209
Pass | 2016 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	131,410
Pass | Prior to 2016 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	9,503,766
Pass | Prior to 2016 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	153,233
Pass | Revolving Loans | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	23,914
Pass | Revolving Loans | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	976,487
Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	1,143,018
Special Mention | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	3,892
Special Mention | 2019 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	216,236
Special Mention | 2019 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	42
Special Mention | 2018 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	129,332
Special Mention | 2017 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	246,885
Special Mention | 2016 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	303,899
Special Mention | Prior to 2016 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	245,876
Special Mention | Revolving Loans | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	790
Special Mention | Revolving Loans | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	3,850
Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	178,581
Substandard | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	60,210
Substandard | 2020 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	3,652
Substandard | 2019 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	8,338
Substandard | 2018 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	18,410
Substandard | 2018 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	3,709
Substandard | 2017 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	32,746
Substandard | 2017 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	13,918
Substandard | 2016 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	44,819
Substandard | 2016 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	1,528
Substandard | Prior to 2016 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	82,606
Substandard | Prior to 2016 | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	2,235
Substandard | Revolving Loans | Other loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	$ 26,830