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Loans And Allowance For Loan Losses (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract | Jan. 01, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable, impaired, interest lost on nonaccrual loans | $ 12,600,000 | $ 6,100,000 |  |
Loans pledged as collateral | 15,050,000,000.00 | 12,110,000,000 |  |
Modifications, post-modification recorded investment | 76,615,000 | 49,859,000 | $ 49,827,000 |
Provision for losses on loans | 336,052,000 | 87,720,000 | 51,697,000 |
Financing Receivable, before Allowance for Credit Loss and Fee | 38,330,656,000 | 37,187,814,000 |  |
Transfers to held for sale | 1,430,000,000 |  |  |
Provision for credit losses | 355,022,000 | 87,720,000 | 51,697,000 |
Purchased credit-impaired loans |  |  | 0 |
Allowance for purchased credit-impaired loans |  | 0 | 0 |
Provision for Loan, Lease, and Other Losses | 355,000,000.0 |  |  |
Investments income recognized in impairment loans, excluding TDRs |  | 0 | 0 |
Financing Receivable, Change in Method, Credit Loss Expense (Reversal) | 18,300,000 |  |  |
Principal Forgiveness |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Modifications, post-modification recorded investment | $ 0 | $ 0 | $ 0 |
Troubled Debt Restructuring That Subsequently Defaulted |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Subsequent default, number of contracts | contract | 7,000 | 4 | 8 |
Modifications, post-modification recorded investment | $ 21,700,000 | $ 326,000 | $ 10,500,000 |
FCB Financial Holdings, Inc. |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans |  |  |  | $ 9,290,000,000
Total commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Modifications, post-modification recorded investment | 28,917,000 | 28,793,000 | 21,058,000 |
Financing Receivable, before Allowance for Credit Loss and Fee | 19,373,679,000 | 16,769,370,000 |  |
Total commercial and industrial | Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss and Fee | 2,190,000,000 |  |  |
Total commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Modifications, post-modification recorded investment | 34,579,000 | 5,590,000 | 16,758,000 |
Financing Receivable, before Allowance for Credit Loss and Fee | 10,570,434,000 | 10,493,784,000 |  |
Total consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Modifications, post-modification recorded investment | 13,119,000 | 15,476,000 | $ 12,011,000 |
Financing Receivable, before Allowance for Credit Loss and Fee | $ 8,386,543,000 | $ 9,924,660,000 |  |

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- Definition Amount, before allowance for credit loss and fee, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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