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Summary Of Significant Accounting And Reporting Policies (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) branch | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Condensed Financial Statements, Captions [Line Items] |  |  |
Number of Reportable Segments | 1 |  |
Gain on divestiture of business, net of tax |  |  | $ 5,800
DiscontinuationofInterestThresholdDays | 90 days |  |
Past Due Threshold in Days | 30 days |  |
Other real estate, foreclosed assets, and repossessed assets | $ 3,600 | $ 4,600 |
Investments in affordable housing limited partnerships | 1,300 | 300 |
ReclasificationofResidualtTaxImpactofTaxRateChange | 0 |  |
Cash paid for interest | 16,400 | 13,100 | 11,800
Income taxes paid | $ 22,600 | $ 16,300 | $ 26,300
City National |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Number of offices | branch | 86 |  |
Residential real estate |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Threshold period past due for write-off of financing receivable | 120 days |  |
Commercial Industrial Loans And Commercial Real Estate |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Threshold period past due for write-off of financing receivable | 120 days |  |
Consumer Loan |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Threshold period past due for write-off of financing receivable | 120 days |  |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
ReclasificationofResidualtTaxImpactofTaxRateChange | $ (999) |  |

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