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Loans and Leases - Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade and Sub Class (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | $ 988,102 | $ 537,881 | $ 200,307 | $ 193,149 | $ 192,749 | $ 180,424
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | $ 24,388,108 |  |  |
Loan balances percentage of total |  |  | 100.00% |  |  |
Allowance for loan and lease losses |  |  | $ 158,598 |  |  |
Collectively evaluated for impairment |  |  | $ 24,273,207 |  |  |
Percent loan collectively evaluated for impairment |  |  | 100.00% |  |  |
Charge-offs |  |  | $ 151,554 |  |  |
Individually evaluated for impairment |  |  | $ 84,001 |  |  |
Percent loan individually evaluated for impairment |  |  | 0.00% |  |  |
Balance as of January 1, 2019 |  |  | $ 6,196 |  |  |
Purchased credit-impaired loans |  |  | $ 30,900 |  |  |
Percent loan purchased credit impaired |  |  | 0.00% |  |  |
Allowance - purchased credit-impaired loans |  |  | $ 848 |  |  |
Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 489,094 | $ 318,722 | 122,486 | $ 114,130 | $ 116,096 | $ 98,947
C&I | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | 15,640,208 |  |  |
Collectively evaluated for impairment |  |  | 15,531,845 |  |  |
Individually evaluated for impairment |  |  | 82,438 |  |  |
Purchased credit-impaired loans |  |  | 25,925 |  |  |
Loans to mortgage companies | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | 4,410,883 |  |  |
Collectively evaluated for impairment |  |  | 4,410,883 |  |  |
Individually evaluated for impairment |  |  | 0 |  |  |
Purchased credit-impaired loans |  |  | 0 |  |  |
CRE | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | 4,337,017 |  |  |
Collectively evaluated for impairment |  |  | 4,330,479 |  |  |
Individually evaluated for impairment |  |  | 1,563 |  |  |
Purchased credit-impaired loans |  |  | 4,975 |  |  |
TRUPS | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | $ 18,200 |  | 19,100 |  |  |
PD Grade 1 -12 | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | $ 23,699,190 |  |  |
Loan balances percentage of total |  |  | 98.00% |  |  |
Allowance for loan and lease losses |  |  | $ 114,094 |  |  |
PD Grade 1 -12 | C&I | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | 15,035,946 |  |  |
PD Grade 1 -12 | Loans to mortgage companies | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | 4,410,883 |  |  |
PD Grade 1 -12 | CRE | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | 4,252,361 |  |  |
PD Grade 13 | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | $ 266,915 |  |  |
Loan balances percentage of total |  |  | 1.00% |  |  |
Allowance for loan and lease losses |  |  | $ 8,142 |  |  |
PD Grade 13 | C&I | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | 232,823 |  |  |
PD Grade 13 | Loans to mortgage companies | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | 0 |  |  |
PD Grade 13 | CRE | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | 34,092 |  |  |
PD Grade 14 15 16 | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | $ 307,102 |  |  |
Loan balances percentage of total |  |  | 1.00% |  |  |
Allowance for loan and lease losses |  |  | $ 29,318 |  |  |
PD Grade 14 15 16 | C&I | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | 263,076 |  |  |
PD Grade 14 15 16 | Loans to mortgage companies | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | 0 |  |  |
PD Grade 14 15 16 | CRE | Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan balance |  |  | $ 44,026 |  |  |

X
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