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Fair Value of Assets and Liabilities - Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | $ 449 | $ 405
Loans and leases | 58,600 | 58,232
Non Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans and leases | 69 | 77
OREO | 11 | 15
Other assets | 11 | 9
Non Recurring | First Mortgages |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | 1 | 1
Non Recurring | Small Business Administration And USDA |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | 300 | 509
Non Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans and leases | 0 | 0
OREO | 0 | 0
Other assets | 0 | 0
Non Recurring | Level 1 | First Mortgages |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | 0 | 0
Non Recurring | Level 1 | Small Business Administration And USDA |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | 0 | 0
Non Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans and leases | 0 | 0
OREO | 0 | 0
Other assets | 0 | 0
Non Recurring | Level 2 | First Mortgages |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | 0 | 0
Non Recurring | Level 2 | Small Business Administration And USDA |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | 299 | 508
Non Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans and leases | 69 | 77
OREO | 11 | 15
Other assets | 11 | 9
Non Recurring | Level 3 | First Mortgages |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | 1 | 1
Non Recurring | Level 3 | Small Business Administration And USDA |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale | $ 1 | $ 1

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