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Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,436,131,000	$ 2,436,131,000
Amortization of core deposit intangibles	2,391,000	5,344,000	$ 8,297,000
Mortgage servicing rights	233,961,000	247,734,000
Mortgage Banking Income
Finite-Lived Intangible Assets [Line Items]
Contractually specified servicing fees, late fees, and ancillary fees earned in exchange for servicing financial assets	1,300,000	941,000	$ 1,400,000
Mortgage Receivable
Finite-Lived Intangible Assets [Line Items]
Unpaid principal balance of loans serviced for others	25,100,000,000	$ 24,200,000,000
Impairment of intangible assets	0
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Expected amortization of core deposit intangibles in 2017	$ 208,000
Core deposit intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization period for core deposit intangibles (in years)	10 years

X

- Definition

Amount of loans serviced for others.

+ References

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
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- Definition

The total amount of contractually specified servicing fees, late fees, and ancillary fees earned for each period for which results of operations are presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
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-Paragraph 2
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

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Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

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