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Acquisitions and Divestitures - Purchase Price Allocation (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2017 | Apr. 03, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  | $ 0 |  | $ 45,934 |  | $ 1,195,482 |
Assets: |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  |  |  |  |  | 633,728 |  | 781,291 |  |  |
Interest-bearing cash |  |  |  |  |  | 482,405 |  | 1,277,611 |  |  |
Trading securities |  |  |  |  |  | 1,346,207 |  | 1,448,168 |  |  |
Loans held-for-sale | [1] |  |  |  |  | 593,790 |  | 679,149 |  |  |
Securities held-to-maturity (Note 3) |  |  |  |  |  | 10,000 |  | 10,000 |  |  |
Loans, net of unearned income |  |  |  |  |  | 31,061,111 | [2] | 27,535,532 | [2] | 27,658,929 |
Allowance for loan losses |  |  |  |  |  | (200,307) |  | (180,424) |  | (189,555) | $ (202,068)
Goodwill |  |  |  |  |  | 1,432,787 |  | 1,432,787 |  | 1,386,853 | 191,371
Other intangible assets |  |  |  |  |  | 130,200 |  | 155,034 |  |  |
Premises and equipment, net |  |  |  |  |  | 455,006 |  | 494,041 |  |  |
Other real estate owned (OREO) | [3] |  |  |  |  | 17,838 |  | 25,290 |  |  |
Other assets |  |  |  |  |  | 2,046,338 |  | 1,802,939 |  |  |
Total assets |  |  |  |  |  | 43,310,900 |  | 40,832,258 |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  |  |  |  | 32,429,535 |  | 32,682,992 |  |  |
Securities sold under agreements to repurchase |  |  |  |  |  | 716,925 |  | 762,592 |  |  |
Other short-term borrowings |  |  |  |  |  | 2,253,045 |  | 114,764 |  |  |
Fixed income payables |  |  |  |  |  | 49,535 |  | 9,572 |  |  |
Term borrowings (Note 10) |  |  |  |  |  | 791,368 |  | 1,170,963 |  |  |
Other liabilities |  |  |  |  |  | 873,079 |  | 580,335 |  |  |
Total liabilities |  |  |  |  |  | 38,234,892 |  | 36,046,878 |  |  |
Consideration paid: |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 1,432,787 |  | 1,432,787 |  | 1,386,853 | $ 191,371
Capital Bank Financial Corporation |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  | $ 0 |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 1,192,839 |  |  |  |  |  |  |  |  |
Assets As Recorded: |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 205,999 |  |  |  |  |  |  |  |  |
Trading securities |  | 0 |  |  |  |  |  |  |  |  |
Loans held-for-sale |  | 122,969 |  |  |  |  |  |  |  |  |
Securities available-for-sale |  | 1,193,393 |  |  |  |  |  |  |  |  |
Securities held-to-maturity |  | 0 |  |  |  |  |  |  |  |  |
Loans |  | 7,276,544 |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 0 |  |  |  |  |  |  |  |  |
Other intangible assets |  | 141,207 |  |  |  |  |  |  |  |  |
Premises and equipment |  | 223,882 |  |  |  |  |  |  |  |  |
OREO |  | 33,613 |  |  |  |  |  |  |  |  |
Other assets |  | 636,130 |  |  |  |  |  |  |  |  |
Total assets acquired |  | 9,833,737 |  |  |  |  |  |  |  |  |
Liabilities As Recorded: |  |  |  |  |  |  |  |  |  |  |
Deposits |  | 8,140,102 |  |  |  |  |  |  |  |  |
Securities sold under agreements to repurchase |  | 26,664 |  |  |  |  |  |  |  |  |
Other short-term borrowings |  | 390,391 |  |  |  |  |  |  |  |  |
Term borrowings |  | 187,169 |  |  |  |  |  |  |  |  |
Other liabilities |  | 65,917 |  |  |  |  |  |  |  |  |
Total liabilities assumed |  | 8,810,243 |  |  |  |  |  |  |  |  |
Net assets acquired |  | 1,023,494 |  |  |  |  |  |  |  |  |
Consideration paid: |  |  |  |  |  |  |  |  |  |  |
Equity |  | (1,746,718) |  |  |  |  |  |  |  |  |
Cash |  | (423,600) |  | $ (46,000) | $ (469,615) |  |  |  |  |  |
Total consideration paid |  | (2,216,333) |  |  |  |  |  |  |  |  |
Goodwill |  | 1,192,839 |  |  |  |  |  |  |  |  |
Capital Bank Financial Corporation | Purchase Accounting/Fair Value Adjustments |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  |  |  |  |  |  |  | 0 |  | 0 |
Trading securities |  |  |  |  |  |  |  | 0 |  | (4,758) |
Loans held-for-sale |  |  |  |  |  |  |  | (11,034) |  | 134,003 |
Securities available-for-sale |  |  |  |  |  |  |  | 0 |  | 175,526 |
Securities held-to-maturity (Note 3) |  |  |  |  |  |  |  | 0 |  | (177,549) |
Loans, net of unearned income |  |  |  |  |  |  |  | 867 |  | (320,372) |
Allowance for loan losses |  |  |  |  |  |  |  | 0 |  | 45,711 |
Goodwill |  |  |  |  |  |  |  | 0 |  | (231,292) |
Other intangible assets |  |  |  |  |  |  |  | (2,593) |  | 119,302 |
Premises and equipment, net |  |  |  |  |  |  |  | (9,470) |  | 37,054 |
Other real estate owned (OREO) |  |  |  |  |  |  |  | (315) |  | (9,149) |
Other assets |  |  |  |  |  |  |  | (22,422) |  | 41,320 |
Total assets |  |  |  |  |  |  |  | (44,967) |  | (190,204) |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  |  |  |  |  |  | (642) |  | (849) |
Securities sold under agreements to repurchase |  |  |  |  |  |  |  | 0 |  | 0 |
Other short-term borrowings |  |  |  |  |  |  |  | 0 |  | 0 |
Term borrowings (Note 10) |  |  |  |  |  |  |  | 0 |  | 67,683 |
Other liabilities |  |  |  |  |  |  |  | 1,631 |  | 4,291 |
Total liabilities |  |  |  |  |  |  |  | 989 |  | 71,125 |
Net assets acquired |  |  |  |  |  |  |  | (45,956) |  | (261,329) |
Consideration paid: |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 0 |  | $ (231,292) |
Coastal Securities, Inc |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 44,964 |  |  |  |  |  |  |  |
Assets As Recorded: |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 7,502 |  |  |  |  |  |  |  |
Interest-bearing cash |  |  | 4,132 |  |  |  |  |  |  |  |
Trading securities |  |  | 139,082 |  |  |  |  |  |  |  |
Loans held-for-sale |  |  | 236,088 |  |  |  |  |  |  |  |
Investment securities |  |  | 1,413 |  |  |  |  |  |  |  |
Other intangible assets |  |  | 27,300 |  |  |  |  |  |  |  |
Premises and equipment |  |  | 1,229 |  |  |  |  |  |  |  |
Other assets |  |  | 1,672 |  |  |  |  |  |  |  |
Total assets acquired |  |  | 418,418 |  |  |  |  |  |  |  |
Liabilities As Recorded: |  |  |  |  |  |  |  |  |  |  |
Securities sold under agreements to repurchase |  |  | 201,595 |  |  |  |  |  |  |  |
Other short-term borrowings |  |  | 33,509 |  |  |  |  |  |  |  |
Fixed income payables |  |  | 96,489 |  |  |  |  |  |  |  |
Other liabilities |  |  | 316 |  |  |  |  |  |  |  |
Total liabilities assumed |  |  | 331,909 |  |  |  |  |  |  |  |
Net assets acquired |  |  | 86,509 |  |  |  |  |  |  |  |
Consideration paid: |  |  |  |  |  |  |  |  |  |  |
Cash |  |  | (131,473) |  |  |  |  |  |  |  |
Goodwill |  |  | 44,964 |  |  |  |  |  |  |  |
Coastal Securities, Inc | Purchase Accounting/Fair Value Adjustments |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  |  | 0 |  |  |  |  |  |  |  |
Interest-bearing cash |  |  | 0 |  |  |  |  |  |  |  |
Trading securities |  |  | (284,580) |  |  |  |  |  |  |  |
Loans held-for-sale |  |  | 236,088 |  |  |  |  |  |  |  |
Investment securities |  |  | 1,413 |  |  |  |  |  |  |  |
Other intangible assets |  |  | 27,300 |  |  |  |  |  |  |  |
Premises and equipment, net |  |  | 0 |  |  |  |  |  |  |  |
Other assets |  |  | 14 |  |  |  |  |  |  |  |
Total assets |  |  | (19,765) |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Securities sold under agreements to repurchase |  |  | 0 |  |  |  |  |  |  |  |
Other short-term borrowings |  |  | 0 |  |  |  |  |  |  |  |
Fixed income payables |  |  | (47,158) |  |  |  |  |  |  |  |
Other liabilities |  |  | (642) |  |  |  |  |  |  |  |
Total liabilities |  |  | (47,800) |  |  |  |  |  |  |  |
Net assets acquired |  |  | 28,035 |  |  |  |  |  |  |  |
Capital Bank Financial Corporation |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | 205,999 |  |  |  |  |  |  |  |  |
Trading securities |  | 4,758 |  |  |  |  |  |  |  |  |
Loans held-for-sale |  | 0 |  |  |  |  |  |  |  |  |
Securities available-for-sale |  | 1,017,867 |  |  |  |  |  |  |  |  |
Securities held-to-maturity (Note 3) |  | 177,549 |  |  |  |  |  |  |  |  |
Loans, net of unearned income |  | 7,596,049 |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | (45,711) |  |  |  |  |  |  |  |  |
Goodwill |  | 231,292 |  |  |  |  |  |  |  |  |
Other intangible assets |  | 24,498 |  |  |  |  |  |  |  |  |
Premises and equipment, net |  | 196,298 |  |  |  |  |  |  |  |  |
Other real estate owned (OREO) |  | 43,077 |  |  |  |  |  |  |  |  |
Other assets |  | 617,232 |  |  |  |  |  |  |  |  |
Total assets |  | 10,068,908 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Deposits |  | 8,141,593 |  |  |  |  |  |  |  |  |
Securities sold under agreements to repurchase |  | 26,664 |  |  |  |  |  |  |  |  |
Other short-term borrowings |  | 390,391 |  |  |  |  |  |  |  |  |
Term borrowings (Note 10) |  | 119,486 |  |  |  |  |  |  |  |  |
Other liabilities |  | 59,995 |  |  |  |  |  |  |  |  |
Total liabilities |  | 8,738,129 |  |  |  |  |  |  |  |  |
Net assets acquired |  | 1,330,779 |  |  |  |  |  |  |  |  |
Consideration paid: |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 231,292 |  |  |  |  |  |  |  |  |
Coastal Securities, Inc |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  |  | 7,502 |  |  |  |  |  |  |  |
Interest-bearing cash |  |  | 4,132 |  |  |  |  |  |  |  |
Trading securities |  |  | 423,662 |  |  |  |  |  |  |  |
Loans held-for-sale |  |  | 0 |  |  |  |  |  |  |  |
Investment securities |  |  | 0 |  |  |  |  |  |  |  |
Other intangible assets |  |  | 0 |  |  |  |  |  |  |  |
Premises and equipment, net |  |  | 1,229 |  |  |  |  |  |  |  |
Other assets |  |  | 1,658 |  |  |  |  |  |  |  |
Total assets |  |  | 438,183 |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Securities sold under agreements to repurchase |  |  | 201,595 |  |  |  |  |  |  |  |
Other short-term borrowings |  |  | 33,509 |  |  |  |  |  |  |  |
Fixed income payables |  |  | 143,647 |  |  |  |  |  |  |  |
Other liabilities |  |  | 958 |  |  |  |  |  |  |  |
Total liabilities |  |  | 379,709 |  |  |  |  |  |  |  |
Net assets acquired |  |  | $ 58,474 |  |  |  |  |  |  |  |
[1] | December 31, 2019 and 2018 include $6.8 million and $8.4 million, respectively, of held-for-sale consumer mortgage loans secured by residential real estate in process of foreclosure.
[2] | December 31, 2019 and 2018 include $18.8 million and $28.6 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.
[3] | December 31, 2019 and 2018 include $9.2 million and $9.7 million, respectively, of foreclosed residential real estate.

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