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Summary Of Significant Accounting And Reporting Policies (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) branch | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) branch | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  | $ 0 | $ 0 |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ (1,246) | $ 384 | $ 492 | $ 280 | $ (90) |  |
Number of Reportable Segments |  |  |  |  | 1 |  |
DiscontinuationofInterestThresholdDays |  |  |  |  | 90 days |  |
Past Due Threshold in Days |  |  |  |  | 30 days |  |
Other real estate, foreclosed assets, and repossessed assets | 4,600 |  |  |  | $ 4,600 | 3,600 |
Investments in affordable housing limited partnerships | $ 5,400 |  |  |  | 5,400 | 1,300 |
Cash paid for interest |  |  |  |  | 24,800 | 16,400 | $ 13,100
Income taxes paid |  |  |  |  | $ 20,800 | 22,600 | $ 16,300
City National |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Number of offices | branch | 100 |  |  |  | 100 |  |
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 |  |
Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  | $ 999 |
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  | $ 2,657 |  |

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