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Loans and Allowance for Loan Losses (Schedule of Current, Accruing Past Due and Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jan. 01, 2019
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SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | $ 39,914,297 | $ 37,162,450 |
Non-accrual | 120,956 | 99,848 |
Non-accrual, without an allowance | 26,481 |  |
Total loans | 40,012,482 | 37,187,814 |
Deferred fees and costs, net | 98,200 | 25,400 |
FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 5,557,334 |
Loans | 90,300 |  | $ 9,290,000
Acquired Loans, ASC 310-30 | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 1,800 |  |
Total commercial and industrial |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 76,741 | 65,797 |
Non-accrual, without an allowance | 25,864 |  |
Total loans | 19,938,276 | 16,769,370 |
Total commercial and industrial | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 1,842,331 |
Total commercial and industrial | Commercial, financial and agricultural |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 67,535 | 56,017 |
Non-accrual, without an allowance | 15,465 |  |
Total loans | 13,136,696 | 10,239,559 |
Total commercial and industrial | Commercial, financial and agricultural | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 1,019,135 |
Total commercial and industrial | Owner-occupied |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 9,206 | 9,780 |
Non-accrual, without an allowance | 10,399 |  |
Total loans | 6,801,580 | 6,529,811 |
Total commercial and industrial | Owner-occupied | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 823,196 |
Total commercial real estate |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 8,377 | 4,944 |
Non-accrual, without an allowance | 265 |  |
Total loans | 10,827,535 | 10,493,784 |
Total commercial real estate | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 1,856,170 |
Total commercial real estate | Investment properties |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 1,638 | 1,581 |
Non-accrual, without an allowance | 0 |  |
Total loans | 9,447,200 | 9,004,327 |
Total commercial real estate | Investment properties | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 1,736,608 |
Total commercial real estate | 1-4 family properties |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 4,437 | 2,253 |
Non-accrual, without an allowance | 0 |  |
Total loans | 696,808 | 780,015 |
Total commercial real estate | 1-4 family properties | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 41,401 |
Total commercial real estate | Land and development |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 2,302 | 1,110 |
Non-accrual, without an allowance | 265 |  |
Total loans | 683,527 | 709,442 |
Total commercial real estate | Land and development | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 78,161 |
Total consumer |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 35,838 | 29,107 |
Non-accrual, without an allowance | 352 |  |
Total loans | 9,246,671 | 9,924,660 |
Total consumer | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 1,858,833 |
Total consumer | Consumer mortgages |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 17,086 | 11,369 |
Non-accrual, without an allowance | 352 |  |
Total loans | 5,811,376 | 5,546,368 |
Total consumer | Consumer mortgages | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 1,848,493 |
Total consumer | Home equity lines |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 14,200 | 12,034 |
Non-accrual, without an allowance | 0 |  |
Total loans | 1,710,264 | 1,713,157 |
Total consumer | Home equity lines | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 2,155 |
Total consumer | Credit cards |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 0 | 0 |
Non-accrual, without an allowance | 0 |  |
Total loans | 250,448 | 268,841 |
Total consumer | Credit cards | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 0 |
Total consumer | Other consumer loans |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Non-accrual | 4,552 | 5,704 |
Non-accrual, without an allowance | 0 |  |
Total loans | 1,474,583 | 2,396,294 |
Total consumer | Other consumer loans | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
ASC 310-30 Loans |  | 8,185 |
Current |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 39,818,655 | 31,442,999 |
Current | Total commercial and industrial |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 19,820,626 | 14,815,380 |
Current | Total commercial and industrial | Commercial, financial and agricultural |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 13,041,583 | 9,124,285 |
Current | Total commercial and industrial | Owner-occupied |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 6,779,043 | 5,691,095 |
Current | Total commercial real estate |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 10,814,720 | 8,628,141 |
Current | Total commercial real estate | Investment properties |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 9,444,615 | 7,264,794 |
Current | Total commercial real estate | 1-4 family properties |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 689,660 | 733,984 |
Current | Total commercial real estate | Land and development |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 680,445 | 629,363 |
Current | Total consumer |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 9,183,309 | 7,999,478 |
Current | Total consumer | Consumer mortgages |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 5,786,762 | 3,681,553 |
Current | Total consumer | Home equity lines |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 1,692,542 | 1,691,759 |
Current | Total consumer | Credit cards |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 243,333 | 263,065 |
Current | Total consumer | Other consumer loans |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 1,460,672 | 2,363,101 |
Accruing 30 to 89 Days Past Due |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 37,999 | 81,330 |
Accruing 30 to 89 Days Past Due | Acquired Loans, ASC 310-30 | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans | 26,500 |  |
Accruing 30 to 89 Days Past Due | Total commercial and industrial |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 11,409 | 44,080 |
Accruing 30 to 89 Days Past Due | Total commercial and industrial | Commercial, financial and agricultural |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 9,515 | 38,916 |
Accruing 30 to 89 Days Past Due | Total commercial and industrial | Owner-occupied |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 1,894 | 5,164 |
Accruing 30 to 89 Days Past Due | Total commercial real estate |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 2,805 | 4,225 |
Accruing 30 to 89 Days Past Due | Total commercial real estate | Investment properties |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 829 | 1,344 |
Accruing 30 to 89 Days Past Due | Total commercial real estate | 1-4 family properties |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 1,507 | 2,073 |
Accruing 30 to 89 Days Past Due | Total commercial real estate | Land and development |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 469 | 808 |
Accruing 30 to 89 Days Past Due | Total consumer |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 23,785 | 33,025 |
Accruing 30 to 89 Days Past Due | Total consumer | Consumer mortgages |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 7,176 | 4,223 |
Accruing 30 to 89 Days Past Due | Total consumer | Home equity lines |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 3,495 | 7,038 |
Accruing 30 to 89 Days Past Due | Total consumer | Credit cards |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 4,395 | 3,076 |
Accruing 30 to 89 Days Past Due | Total consumer | Other consumer loans |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 8,719 | 18,688 |
Accruing 90 to 149 Days Past Due |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 8,391 | 6,303 |
Accruing 90 to 149 Days Past Due | Acquired Loans, ASC 310-30 | FCB Financial Holdings, Inc. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans | 9,600 |  |
Accruing 90 to 149 Days Past Due | Total commercial and industrial |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 3,636 | 1,782 |
Accruing 90 to 149 Days Past Due | Total commercial and industrial | Commercial, financial and agricultural |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 2,598 | 1,206 |
Accruing 90 to 149 Days Past Due | Total commercial and industrial | Owner-occupied |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 1,038 | 576 |
Accruing 90 to 149 Days Past Due | Total commercial real estate |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 1,368 | 304 |
Accruing 90 to 149 Days Past Due | Total commercial real estate | Investment properties |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 118 | 0 |
Accruing 90 to 149 Days Past Due | Total commercial real estate | 1-4 family properties |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 1,204 | 304 |
Accruing 90 to 149 Days Past Due | Total commercial real estate | Land and development |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 46 | 0 |
Accruing 90 to 149 Days Past Due | Total consumer |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 3,387 | 4,217 |
Accruing 90 to 149 Days Past Due | Total consumer | Consumer mortgages |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 0 | 730 |
Accruing 90 to 149 Days Past Due | Total consumer | Home equity lines |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 27 | 171 |
Accruing 90 to 149 Days Past Due | Total consumer | Credit cards |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 2,720 | 2,700 |
Accruing 90 to 149 Days Past Due | Total consumer | Other consumer loans |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 640 | 616 |
Total Accruing Past Due |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 46,390 | 87,633 |
Total Accruing Past Due | Total commercial and industrial |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 15,045 | 45,862 |
Total Accruing Past Due | Total commercial and industrial | Commercial, financial and agricultural |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 12,113 | 40,122 |
Total Accruing Past Due | Total commercial and industrial | Owner-occupied |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 2,932 | 5,740 |
Total Accruing Past Due | Total commercial real estate |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 4,173 | 4,529 |
Total Accruing Past Due | Total commercial real estate | Investment properties |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 947 | 1,344 |
Total Accruing Past Due | Total commercial real estate | 1-4 family properties |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 2,711 | 2,377 |
Total Accruing Past Due | Total commercial real estate | Land and development |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 515 | 808 |
Total Accruing Past Due | Total consumer |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 27,172 | 37,242 |
Total Accruing Past Due | Total consumer | Consumer mortgages |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 7,176 | 4,953 |
Total Accruing Past Due | Total consumer | Home equity lines |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 3,522 | 7,209 |
Total Accruing Past Due | Total consumer | Credit cards |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 7,115 | 5,776 |
Total Accruing Past Due | Total consumer | Other consumer loans |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | $ 9,359 | $ 19,304 |

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