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Loans and Allowance for Loan Losses (Narrative) (Details) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) contract | Jun. 30, 2021 USD ($) contract | Jun. 30, 2022 USD ($) contract | Jun. 30, 2021 USD ($) contract | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and leases receivable, impaired, interest lost on nonaccrual loans | $ 2,000,000 | $ 2,700,000 | $ 5,400,000 | $ 6,200,000 |  |  |  |
Interest income, cash basis method | 410,000 | 575,000 | 964,000 | 1,200,000 |  |  |  |
Total loans | 41,204,780,000 |  | 41,204,780,000 |  |  | $ 39,311,958,000 |  |
Allowance for loan losses | 407,837,000 | 516,708,000 | 407,837,000 | 516,708,000 | $ 414,956,000 | 427,597,000 | $ 563,214,000 | $ 605,736,000
Reserve for unfunded commitments | 50,600,000 |  | 50,600,000 |  |  | 41,900,000 |  |
All financing receivable, allowance for credit loss | $ 458,400,000 |  | 458,400,000 |  |  | $ 469,500,000 |  |
Allowance for credit loss, decrease |  |  | $ (11,100,000) |  |  |  |  |
ACL to loans ratio | 1.11% |  | 1.11% |  |  |  |  |
Decrease in ACL to loans ratio |  |  | 0.0008 |  |  |  |  |
Allowance for credit loss, reasonable and supportable forecast period |  |  | 2 years |  |  |  |  |
Allowance for credit loss, straight-line basis historical period |  |  | 1 year |  |  |  |  |
Downside bias | 60.00% |  | 60.00% |  |  | 43.00% |  |
Provision for (reversal of) credit losses | $ 12,688,000 | (24,598,000) | $ 24,088,000 | (43,173,000) |  |  |  |
Net chargeoff amount | 16,600,000 |  | 35,200,000 |  |  |  |  |
Financing receivable, allowance for credit loss, period increase (decrease) from increase in size of loan profile | 3,700,000 |  | 7,500,000 |  |  |  |  |
Financing receivable, purchase | 180,200,000 |  | 361,600,000 |  |  |  |  |
Recorded investment | 37,282,000 | $ 6,801,000 | 78,925,000 | $ 22,276,000 |  |  |  |
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 | 3 | 5 | 3 | 5 |  |  |  |
Recorded investment | $ 430,000 | $ 172,000 | $ 430,000 | $ 172,000 |  |  |  |
Baseline |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Projected unemployment rate | 3.60% |  | 3.60% |  |  | 4.00% |  |
Baseline | Minimum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Projected unemployment rate |  |  |  |  |  | 3.50% |  |
Downside |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Projected unemployment rate | 5.20% |  | 5.20% |  |  |  |  |
Substandard |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Retail loan substandard period (in days) |  |  | 90 days |  |  |  |  |
Loss |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Retail loan charge off (in days) |  |  | 120 days |  |  |  |  |
Total commercial and industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans | $ 20,778,325,000 |  | $ 20,778,325,000 |  |  | $ 19,622,924,000 |  |
Recorded investment | 31,230,000 | $ 4,099,000 | 59,632,000 | $ 11,548,000 |  |  |  |
Total commercial and industrial | Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans | 86,700,000 |  | 86,700,000 |  |  |  |  |
Asset Pledged as Collateral |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans | $ 15,150,000,000 |  | $ 15,150,000,000 |  |  | $ 14,190,000,000 |  |

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