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Loans and Allowances for Credit Losses, Troubled Debt Restructurings (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled Debt Restructuring, Recorded Investment | $ 252,000,000 |  | $ 252,000,000 |  | $ 273,000,000
Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 129,000,000 |  | 129,000,000 |  | 141,000,000
Troubled Debt Restructuring, Recorded Balance Modified During the Period | 10,000,000 | $ 55,000,000 | 28,000,000 | $ 66,000,000 |
Troubled Debt Restructuring, Charge-offs | 1,000 | $ 35,000 | 4,000 | $ 311,000 |
Commercial real estate [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled Debt Restructuring, Specific Allowance | 935,000 |  | 935,000 |  |
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled Debt Restructuring, Recorded Investment | 11,000,000 |  | 11,000,000 |  |
Residential mortgage [Member] | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled Debt Restructuring, Specific Allowance | 0 |  | 0 |  |
Residential mortgage [Member] | Nonperforming Financial Instruments [Member] | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled Debt Restructuring, Recorded Investment | 20,000,000 |  | 20,000,000 |  |
US Government Agency Insured Loans [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled Debt Restructuring, Performing in Accordance With Modified Terms | 97,000,000 |  | 97,000,000 |  | 97,000,000
US Government Agency Insured Loans [Member] | Residential mortgage [Member] | Performing [Member] | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Troubled Debt Restructuring, Recorded Investment | $ 196,000,000 |  | $ 196,000,000 |  | $ 211,000,000

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- Definition Represents the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructuring and are performing according to modified terms. + References No definition available. + Details
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