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Summary Of Significant Accounting And Reporting Policies (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) branch | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Condensed Financial Statements, Captions [Line Items] |  |  |
Document Period End Date | Dec. 31, 2019 |  |
Number of Reportable Segments | 1 |  |
DiscontinuationofInterestThresholdDays | 90 days |  |
Past Due Threshold in Days | 30 days |  |
Other real estate, foreclosed assets, and repossessed assets | $ 4,700 | $ 4,600 |
Amortization Method Qualified Affordable Housing Project Investments | 10,100 | 5,400 |
Cash paid for interest | 37,000 | 24,800 | $ 16,400
Income taxes paid | 14,900 | $ 20,800 | $ 22,600
Qualified Affordable Housing Project Investments, Commitment | $ 3,200 |  |
City National |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Number of offices | branch | 95 |  |
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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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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