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Summary Of Significant Accounting And Reporting Policies (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) branch | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2014 USD ($)
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Past Due Threshold in Days | 30 days |  |  |
Gain on divestiture of business, net of tax | $ 5.8 |  |  |
Other real estate, foreclosed assets, and repossessed assets | $ 4.6 | $ 6.5 |  |
Amount of tax benefit that is greater than | 50.00% |  |  |
Investments in affordable housing limited partnerships | $ 0.3 | 0.5 |  |
Cash paid for interest | 13.1 | 11.8 | $ 12.1 |
Income taxes paid | $ 16.3 | $ 26.3 | $ 23.0 |
Held-to-maturity securities, transferred security, at carrying value |  |  |  | $ 83.4
City National |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Number of offices | branch | 85 |  |  |
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 |  |  |

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