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Acquisition (Schedule of Fair Value of Net Assets Acquired Acquired and Liabilities Assumed - Capital One) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 792,084 | $ 790,972 | $ 745,523
Capital One [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 2,803 |  |
Identifiable intangible assets | 27,562 |  |
Total identifiable assets | 30,365 |  |
Deposit liabilities | 217,432 |  |
Other liabilities | 151 |  |
Total liabilities | 217,583 |  |
Net identifiable assets acquired (liabilities assumed) | (187,218) |  |
Consideration received | 140,657 |  |
Goodwill | $ 46,561 |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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