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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) $ in Millions |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 22, 2015 USD ($) branch loan_production_office | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 06, 2017 complaint | Aug. 30, 2017 complaint | Jul. 28, 2017 complaint
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | $ 26 | $ 24 |  |  |
Conciliation Agreement, Commitment Term | 3 years |  |  |  |  |
Conciliation Agreement, Mortgage Loan Commitment | $ 196 |  |  |  |  |
Conciliation Agreement, Number of Branch Opening Commitments | branch | 1 |  |  |  |  |
Conciliation Agreement, Number of Loan Production Offices, Commitment | loan_production_office | 4 |  |  |  |  |
Loans Repurchased Under Make Whole Requests |  | 1 | $ 1 |  |  |
Loans Sold To Outside Investors Original Amount |  | $ 10,500 |  |  |  |
Loans Sold To Outside Investors Loss ReimbursementSettlement Paid |  | zero | negligible |  |  |
Loans Sold To Outside Investors Remaining Outstanding Amount |  | $ 6,200 |  |  |  |
Residential Mortgage Loans Sold With Recourse Risk |  | 39 | $ 44 |  |  |
Residential Mortgage Loans Sold With Credit Recourse Risk |  | 64 | 73 |  |  |
Schumel et al v. Bank Mutual Corporation et al, and Paquin et al v. Bank Mutual Corporation et al [Domain] |  |  |  |  |  |
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items] |  |  |  |  |  |
Number of complaints filed under legal proceedings | complaint |  |  |  |  |  | 2
Wollenburg et al. v. Bank Mutual Corporation et al. [Member] |  |  |  |  |  |
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items] |  |  |  |  |  |
Number of complaints filed under legal proceedings | complaint |  |  |  |  | 1 |
Parshall et al. v. Bank Mutual Corporation et al. [Member] |  |  |  |  |  |
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items] |  |  |  |  |  |
Number of complaints filed under legal proceedings | complaint |  |  |  | 1 |  |
UnconsolidatedProjectsLowIncomeHousing [Member] |  |  |  |  |  |
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items] |  |  |  |  |  |
Other Investments |  | 137 | 147 |  |  |
Commitments Under Unconsolidated Projects |  | 99 | 119 |  |  |
PrincipalInvestmentCommitment [Member] |  |  |  |  |  |
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items] |  |  |  |  |  |
Other Investments |  | $ 25 | $ 23 |  |  |

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