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Loans and Allowance for Loan Losses (Narrative) (Details) | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) contract | Sep. 30, 2019 USD ($) contract | Sep. 30, 2020 USD ($) contract | Sep. 30, 2019 USD ($) contract | Jun. 30, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Interest income recognized, cash basis |  | $ 1,300,000 | $ 363,000 | $ 2,700,000 | $ 2,000,000.0 |  |  |  |  |
Loans pledged as collateral |  | 15,290,000,000 |  | 15,290,000,000 |  |  |  | $ 12,110,000,000 |  |
Total loans |  | 39,648,824,000 |  | 39,648,824,000 |  |  |  | 37,187,814,000 |  |
Allowance for credit loss, reversal |  | 6,100,000 |  | 19,400,000 |  |  |  |  |  |
Transfer of third-party lending partnership consumer loans to held for sale loans. |  | 513,200,000 |  | 1,310,000,000 |  |  |  |  |  |
Total allowance for loan losses |  | 603,800,000 | 265,013,000 | 603,800,000 | 265,013,000 | $ 588,648,000 | $ 281,402,000 | 281,402,000 | $ 257,376,000 | $ 250,555,000
Reserve for unfunded commitments |  | 60,800,000 |  | 60,800,000 |  |  |  |  |  |
Allowance for credit losses |  | 664,600,000 |  | 664,600,000 |  |  | $ 282,777,000 |  |  |
Allowance for credit loss, increase |  | 14,900,000 |  | 271,400,000 |  |  |  |  |  |
Provision for credit losses | [1] | 43,383,000 | 27,562,000 | $ 343,956,000 | 63,250,000 |  |  |  |  |
Allowance for Loan and Lease Losses Write-offs, Net |  | $ 28,500,000 |  |  |  |  |  |  |  |
Estimated impact of currently enacted stimulus and an unemployment rate for the end of year |  | 8.00% |  | 8.00% |  |  |  |  |  |
ACL to loans ratio during period |  | 0.05% |  |  |  |  |  |  |  |
ACL to loans ratio |  | 1.68% |  | 1.68% |  |  |  |  |  |
ACL to loans ratio, excluding PPP loans |  | 1.80% |  | 1.80% |  |  |  |  |  |
Recorded Investment |  | $ 8,144,000 | $ 14,621,000 | $ 60,492,000 | $ 31,352,000 |  |  |  |  |
Commitments to land additional funds to TDRs |  | $ 0 |  | $ 0 |  |  |  | 0 |  |
Troubled Debt Restructuring That Subsequently Defaults |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Number of contracts | contract |  | 1 | 3 | 5 | 4 |  |  |  |  |
Recorded Investment |  | $ 21,000 | $ 321,000 | $ 666,000 | $ 326,000 |  |  |  |  |
Total commercial and industrial |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans |  | 20,014,151,000 |  | 20,014,151,000 |  |  |  | $ 16,769,370,000 |  |
Recorded Investment |  | 5,758,000 | 8,177,000 | 18,346,000 | 15,822,000 |  |  |  |  |
Total commercial and industrial | Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans |  | 2,710,000,000 |  | 2,710,000,000 |  |  |  |  |  |
Interest Income Recorded |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Interest income recognized |  | $ 4,300,000 | $ 2,500,000 | $ 9,200,000 | $ 8,000,000.0 |  |  |  |  |
Substandard |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Retail loan substandard period (in days) |  |  |  | 90 days |  |  |  |  |  |
Loss and Charged Off |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Retail loan charge off (in days) |  |  |  | 120 days |  |  |  |  |  |
[1] | Beginning January 1, 2020, provision calculation is based on current expected credit loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.

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