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Loans and Allowance for Loan Losses (Schedule of Current, Accruing Past Due and Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | --- | ---
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | $ 39,549,847 | $ 37,162,450 |
Non-accrual | 129,748 | 99,848 |
Non-accrual, without an allowance | 39,089 |  |
Total loans | 39,648,824 | 37,187,814 |
Deferred fees and costs, net | 99,000 | 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 | 78,038 | 65,797 |
Non-accrual, without an allowance | 37,588 |  |
Total loans | 20,014,151 | 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 | 67,415 | 56,017 |
Non-accrual, without an allowance | 27,950 |  |
Total loans | 13,120,038 | 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 | 10,623 | 9,780 |
Non-accrual, without an allowance | 9,638 |  |
Total loans | 6,894,113 | 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 | 32,521 | 4,944 |
Non-accrual, without an allowance | 1,501 |  |
Total loans | 10,965,875 | 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 | 28,260 | 1,581 |
Non-accrual, without an allowance | 0 |  |
Total loans | 9,662,447 | 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 | 2,135 | 2,253 |
Non-accrual, without an allowance | 1,236 |  |
Total loans | 655,038 | 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 | 2,126 | 1,110 |
Non-accrual, without an allowance | 265 |  |
Total loans | 648,390 | 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 | 19,189 | 29,107 |
Non-accrual, without an allowance | 0 |  |
Total loans | 8,668,798 | 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 | 7,433 | 11,369 |
Non-accrual, without an allowance | 0 |  |
Total loans | 5,658,525 | 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 | 10,297 | 12,034 |
Non-accrual, without an allowance | 0 |  |
Total loans | 1,615,207 | 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 | 264,829 | 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 | 1,459 | 5,704 |
Non-accrual, without an allowance | 0 |  |
Total loans | 1,130,237 | 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 | 39,422,671 | 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 | 19,879,223 | 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 | 13,009,877 | 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 | 6,869,346 | 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 | 10,922,402 | 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 | 9,628,029 | 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 | 649,225 | 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 | 645,148 | 629,363 |
Current | Total consumer |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 8,621,046 | 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 | 5,643,745 | 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 | 1,601,705 | 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 | 259,262 | 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 | 1,116,334 | 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 | 49,804 | 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 | 18,098 | 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 | 13,967 | 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 | 4,131 | 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 | 8,295 | 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 | 5,620 | 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 | 2,092 | 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 | 583 | 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 | 23,411 | 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 | 6,475 | 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 | 3,176 | 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 | 1,894 | 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 | 11,866 | 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 | 7,512 | 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 | 1,204 | 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 | 829 | 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 | 375 | 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 | 1,156 | 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 | 538 | 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 | 350 | 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 | 268 | 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 | 5,152 | 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 | 872 | 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 | 29 | 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 | 3,673 | 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 | 578 | 616 |
Total Accruing Past Due |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Loans, net of deferred fees and costs | 57,316 | 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 | 19,302 | 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 | 14,796 | 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 | 4,506 | 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 | 9,451 | 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 | 6,158 | 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 | 2,442 | 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 | 851 | 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 | 28,563 | 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 | 7,347 | 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 | 3,205 | 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 | 5,567 | 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 | $ 12,444 | $ 19,304 |

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