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Loans - Additional Information (Detail) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 29, 2017 USD ($) | Dec. 31, 2017 USD ($) Investment | Dec. 31, 2016 USD ($) Investment | Dec. 31, 2015 USD ($) Investment | Jul. 28, 2017 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties |  |  | $ 59,500,000 |  |  |
Non-Covered Loans |  |  | 38,359,022,000 | $ 37,356,201,000 |  |
Mortgage servicing rights asset |  |  | 2,729,000 | 228,099,000 |  |
Loans held for sale |  |  | 35,258,000 | 409,152,000 |  |
Gain on sale of business |  |  | 0 |  |  |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates |  |  | $ 36,047,000 | $ 13,100,000 | $ 2,144,000 |
Number of loans classified as a non-accrual TDRs | Investment |  |  | 71 | 13 | 8,000 |
Covered loans |  |  | $ 0 | $ 1,698,133,000 |  | $ 0
Provision for (recovery of) losses |  |  | 37,242,000 | 4,180,000 | $ (15,004,000) |
FDIC indemnification expense |  |  |  | 19,000,000 |  |
Freedom Mortgage Corporation |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Mortgage servicing rights asset |  | $ 208,800,000 |  |  |  |
Loans held for sale |  | 20,500,000,000 | 35,300,000 | 409,200,000 |  |
Gain on sale of business |  | 7,400,000 |  |  |  |
Proceeds from sale of business |  | $ 226,600,000 |  |  |  |
Am Trust Bank and Desert Hills Bank |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total loans, net |  |  |  | 2,100,000,000 |  |
Purchased Credit-Impaired Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Non-Covered Loans |  |  |  | 5,762,000 |  |
Purchased credit-impaired loans outstanding |  |  | 0 | 7,000,000 |  |
Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Non-Covered Loans | [1] |  | 2,040,574,000 | 1,900,445,000 |  |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates |  |  | $ 26,409,000 | $ 3,935,000 | $ 1,312,000 |
Number of loans classified as a non-accrual TDRs | Investment |  |  | 65 | 7 | 2,000 |
Commercial and Industrial | Payment Default |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Number of loans classified as a non-accrual TDRs |  |  | 7 |  |  |
Loan classified as non accrual TDRs |  |  | $ 1,600,000 |  |  |
Principal shareholders |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties |  |  | 0 |  |  |
Financing Receivable Troubled Debt Restructurings Rate Reductions |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates |  |  | 44,600,000 |  |  |
Financing Receivable Troubled Debt Restructurings Forbearance of Arrears |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates |  |  | 1,000,000 |  |  |
Home Equity Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  |  | 1 |  |
Loan classified as non accrual TDRs |  |  |  | $ 143,000 |  |
Residential Mortgage |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Mortgage loans on real estate, foreclosures |  |  | 0 | 78,600,000 |  |
Covered Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Current |  |  |  | 1,500,000,000 |  |
Provision for (recovery of) losses |  |  | $ (23,701,000) | (7,694,000) | $ (11,670,000) |
Covered Loans | Performing Financial Instruments | Financing Receivable Recorded Investment 30 to 89 days past due |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total Past Due |  |  |  | 22,600,000 |  |
Covered Loans | Performing Financial Instruments | Loans 90 Days Or More Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total Past Due |  |  |  | $ 131,500,000 |  |
[1] | (1) Includes lease financing receivables, all of which were classified as "pass."

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