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Acquisition Acquisition (Details 2) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Business Combinations [Abstract] |  |  |  |  |  |
Goodwill | $ 19,022 | $ 274,202 |  | $ 274,202 |  | $ 255,353
Business Combination, Acquired Receivables, Gross Contractual Amount | 183,700 |  |  |  |  |
Business Combinatoin, Acquired Receivables, Fair Value Adjustment | 4,300 |  |  |  |  |
Business Combination, Acquired Receivables, Contractual Adjustments | 5,100 |  |  |  |  |
Conversion Related Expenses |  | $ 24 | $ (69) | $ 1,634 | $ 10,412 |
Payments to Acquire Businesses, Gross | $ 17,400 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 2,745,098 |  |  |  |  |
Business Combination, Acquired Receivable, Fair Value | $ 184,506 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Deposits | $ 141,281 |  |  |  |  |

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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