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Rollforward of Financial Instruments Classified in Level Three of Valuation Hierarchy (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 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)	1,467	4,163
Total Realized/Unrealized Gains/ (Losses) Recorded in Comprehensive (Loss) Income	0	0
Transfers to/(from) level 3	0	0
Fair Value, Ending Balance	2,449	6,689
Change in Unrealized Gains/(Losses) Related to Instruments Held	2,430	6,586
Mortgage servicing rights
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)	(2,726)	(37,093)
Total Realized/Unrealized Gains/ (Losses) Recorded in Comprehensive (Loss) Income	0	0
Issuances	7,574	7,948
Settlements	(4,147)	(6,157)
Transfers to/(from) level 3	0	0
Fair Value, Ending Balance	228,800	208,087
Change in Unrealized Gains/(Losses) Related to Instruments Held	$ (2,726)	$ (37,093)

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Change in Unrealized Gains (Losses) Related to Instruments Held

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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)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Amount of gain (loss) recognized in other comprehensive income (loss) 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

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of settlement of 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.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Fair value of 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.

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