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Acquisitions and Divestiture (Narrative) (Details) $ in Thousands |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 09, 2018 USD ($) | Apr. 28, 2017 USD ($) | Mar. 10, 2017 USD ($) entity | Sep. 30, 2018 USD ($) | Jul. 13, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Acquisition related costs |  |  |  | $ 5,700 |
Useful life |  |  |  | 17 years |
Harrison Finance Company [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loss from sale of consumer finance subsidiary | $ 1,100 |  |  |  |
Proceeds from sale of finance subsidiary | $ 78,900 |  |  |  |
FNBC I [Member] | Whitney Bank [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of branches | entity |  |  | 9 |  |
Net of cash acquired |  |  | $ 323,000 |  |
Cash paid |  |  | 326,000 |  |
Cash acquired |  |  | 3,000 |  |
Acquisition, Premium amount to pay |  |  | $ 41,600 |  |
FNBC II [Member] | Whitney Bank [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash received |  | $ 800,000 |  |  |
Cash acquired |  | 158,000 |  |  |
Premium payment |  | 35,000 |  |  |
Unpaid principal balance of the loans acquired, Net liabilities assumed |  | $ 642,000 |  |  |
Capital One [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 27,377 |
Assets under management |  |  |  |  | $ 4,000,000
Assets under management and administration |  |  |  |  | 10,400,000
Cash for customer deposit liabilities assumed |  |  |  |  | $ 217,000

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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