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Loans Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Receivables [Abstract] |  |  |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment |  | $ 4,035 | $ 35,020 |  |
Restructured Loans Subsequently Accruing_String | less than $1 million |  |  |  |
Ytd Restructured Loans Still On Nonaccrual | $ 4,000 | 4,000 |  |  |
UnaccretedPurchaseDiscount |  | 32,000 |  |  |
UnaccretedPurchaseDiscount_PerformingLoans | 26,000 | 26,000 |  |  |
UnaccretedPurchaseDiscount_NonPerformingLoans | 7,000 | 7,000 |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses | 252,601 | 252,601 |  | $ 265,880 | $ 278,335
Oil and Gas Portfolio Segment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses | $ 17,000 | $ 17,000 |  | $ 27,000 | $ 38,000
Percent of loans | 2.50% | 2.50% |  |  |
Bank Mutual [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income, Purchased Credit Impaired Loans And Covered Loans | $ 16,000 | $ 16,000 |  |  |

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- Definition Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio which are purchased credit impaired and those whose losses will be shared with the Federal Deposit Insurance Corporation under loss sharing agreements before deducting the allowance for losses on loans and leases. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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