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Loans - Acquisition (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held-for-sale | [1] | $ 679,149 | $ 699,377 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract] |  |  |  |  |
Less : accretable yield |  | $ (13,375) | $ (15,623) |  | $ (6,871)
Capital Bank Financial Corporation |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unpaid balance |  |  |  | $ 7,600,000 |
Loans held-for-sale |  |  |  | 121,800 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract] |  |  |  |  |
Fair value of loans acquired |  |  |  | 7,400,000 |
Capital Bank Financial Corporation | Non-PCI Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held-for-sale |  |  |  | 117,100 |
Business Combination, Acquired Receivables [Abstract] |  |  |  |  |
Contractually required payments including interest |  |  |  | 9,182,610 |
Less : expected losses and foregone interest |  |  |  | (801,546) |
Cash flows expected to be collected |  |  |  | 8,381,064 |
Fair value of loans acquired |  |  |  | 7,220,094 |
PCI Loans | Capital Bank Financial Corporation |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held-for-sale |  |  |  | 4,700 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract] |  |  |  |  |
Contractually required payments including interest |  |  |  | 258,950 |
Less : nonaccretable difference |  |  |  | (77,022) |
Cash flows expected to be collected |  |  |  | 181,928 |
Less : accretable yield |  |  |  | (14,271) |
Fair value of loans acquired |  |  |  | $ 167,657 |
[1] | December 31, 2018 and 2017 include $8.4 million and $11.7 million, respectively, of held-for-sale consumer mortgage loans secured by residential real estate in process of foreclosure.

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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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