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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items] |  |  |
Off-Balance Sheet, Credit Loss, Liability | $ 38,776,000 | $ 39,776,000 | $ 47,776,000
Provision for credit losses | (1,000,000) | (8,000,000) |
Expense Related to Qualified Affordable Housing Projects | 8,000,000 |  |
Remaining Investment in Qualified Affordable Housing Projects | 253,000,000 | 262,000,000 |
Variable Interest Entity Reporting Entity Involvement Unfunded Obligation Amount | 69,000,000 | 80,000,000 |
Qualified Affordable Housing Investments, Impairment Loss | 0 | 0 |
Loans Repurchased Under Make Whole Requests | $ 2,000,000 | $ 8,000,000 |
Loans Sold To Outside Investors Loss ReimbursementSettlement Paid | no | 114,000 |
Loans Sold To Outside Investors Original Amount | $ 7,200,000,000 |  |
Loans Sold To Outside Investors Remaining Outstanding Amount | 4,600,000,000 |  |
Mortgage Repurchase Reserve | 1,000,000 |  |
Residential Mortgage Loans Sold With Recourse Risk | 8,000,000 | $ 10,000,000 |
Residential Mortgage Loans Sold With Credit Recourse Risk | 23,000,000 | 24,000,000 |
Residential Mortgage Loans with Credit Risk Recourse | 0 |  |
UnconsolidatedProjectsLowIncomeHousing [Member] |  |  |
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items] |  |  |
Other Investments | 259,000,000 | $ 268,000,000 |
PrincipalInvestmentCommitment [Member] |  |  |
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items] |  |  |
Other Investments | $ 25,000,000 |  |

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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + Details
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