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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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