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Loans (Acquisition) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Nov. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract] |  |  |  |  |
Less : accretable yield |  | $ (15,623) |  | $ (6,871) | $ (8,542)
Loans held-for-sale | [1] | $ 699,377 |  | $ 111,248 |
Capital Bank Financial Corporation |  |  |  |  |
Business Combination, Acquired Receivables [Abstract] |  |  |  |  |
Fair value of loans acquired |  |  | $ 7,400,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract] |  |  |  |  |
Loans held-for-sale |  |  | 132,800 |  |
Capital Bank Financial Corporation | Non-PCI Loans |  |  |  |  |
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 |  |  | 7,229,948 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract] |  |  |  |  |
Loans held-for-sale |  |  | 127,800 |  |
PCI Loans | Capital Bank Financial Corporation |  |  |  |  |
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 |  |  | (13,957) |  |
Fair value of loans acquired |  |  | 167,971 |  |
Loans held-for-sale |  |  | $ 5,000 |  |
[1] | December 31, 2017 and 2016 include $11.7 million and $19.3 million, respectively, of held-for-sale consumer mortgage loans secured by residential real estate in process of foreclosure.

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- Definition Business Combination, Acquired Receivables, Cash Flows Expected to be Collected at Acquisition + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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 Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer. + 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 (b)(1) -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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- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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- Definition Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Amount of cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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- Definition Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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- Definition Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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