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Rollforward of Financial Instruments Classified in Level Three of Valuation Hierarchy (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Beginning Balance	$ 982	$ 2,526
Total Realized/Unrealized Gains/ (Losses) Recorded in Income/ (Loss)	45	7,607
Total Realized/Unrealized Gains/ (Losses) Recorded in Comprehensive (Loss) Income	0	0
Settlements	0	0
Transfers to/(from) level 3	0	0
Fair Value, Ending Balance	1,027	10,133
Change in Unrealized Gains/(Losses) Related to Instruments Held	1,027	10,133
Mortgage servicing rights | Covered loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Beginning Balance	228,099	243,389
Total Realized/Unrealized Gains/ (Losses) Recorded in Income/ (Loss)	(19,496)	(74,238)
Total Realized/Unrealized Gains/ (Losses) Recorded in Comprehensive (Loss) Income	0	0
Issuances	11,983	19,180
Settlements	0	0
Transfers to/(from) level 3	0	0
Fair Value, Ending Balance	220,586	188,331
Change in Unrealized Gains/(Losses) Related to Instruments Held	$ (10,348)	$ (60,163)

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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+ References

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-Name Accounting Standards Codification
-Topic 820
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
-Paragraph 2
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