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Loans and Allowance for Loan Losses (Narrative) (Details) | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) contract | Jun. 30, 2019 USD ($) contract | Jun. 30, 2020 USD ($) contract | Jun. 30, 2019 USD ($) contract | Mar. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Interest income recognized, cash basis |  | $ 484,000 | $ 996,000 | $ 1,400,000 | $ 1,600,000 |  |  |  |  |
Loans pledged as collateral |  | 15,420,000,000 |  | 15,420,000,000 |  |  |  | $ 12,110,000,000 |  |
Total loans |  | 40,012,482,000 |  | 40,012,482,000 |  |  |  | 37,187,814,000 |  |
Allowance for credit loss, reversal |  | 13,300,000 |  |  |  |  |  |  |  |
Transfer of third-party lending partnership consumer loans to held for sale loans. |  | 801,000,000.0 |  |  |  |  |  |  |  |
Allowance for credit loss, increase |  | 117,800,000 |  | 256,500,000 |  |  |  |  |  |
Total allowance for loan losses |  | 588,648,000 | 257,376,000 | 588,648,000 | 257,376,000 | $ 493,452,000 | $ 281,402,000 | 281,402,000 | $ 257,036,000 | $ 250,555,000
Reserve for unfunded commitments |  | 61,000,000.0 |  | 61,000,000.0 |  |  |  |  |  |
Allowance for credit losses |  | 649,700,000 |  | 649,700,000 |  |  | $ 282,777,000 |  |  |
Provision for credit losses | [1] | $ 141,851,000 | 12,119,000 | $ 300,573,000 | 35,688,000 |  |  |  |  |
Estimated impact of currently enacted stimulus and an unemployment rate for the end of year |  | 10.00% |  | 10.00% |  |  |  |  |  |
ACL to loans ratio during period |  | 0.24% |  |  |  |  |  |  |  |
ACL to loans ratio |  | 1.63% |  | 1.63% |  |  |  |  |  |
ACL to loans ratio, excluding PPP loans |  | 1.74% |  | 1.74% |  |  |  |  |  |
Recorded Investment |  | $ 15,652,000 | $ 9,225,000 | $ 52,348,000 | $ 16,732,000 |  |  |  |  |
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 | 1 | 4 | 1 |  |  |  |  |
Recorded Investment |  | $ 27,000 | $ 5,000 | $ 645,000 | $ 5,000 |  |  |  |  |
Total commercial and industrial |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans |  | 19,938,276,000 |  | 19,938,276,000 |  |  |  | $ 16,769,370,000 |  |
Recorded Investment |  | 5,390,000 | 4,014,000 | 12,588,000 | 7,645,000 |  |  |  |  |
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 |  | $ 2,800,000 | $ 3,400,000 | $ 4,900,000 | $ 5,500,000 |  |  |  |  |
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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