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Disclosures about Fair Value of Assets and Liabilities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Reduced in carrying amount of mortgage servicing rights	$ (338,000)us-gaap_ServicingAssetAtFairValuePeriodIncreaseDecrease	$ (389,000)us-gaap_ServicingAssetAtFairValuePeriodIncreaseDecrease

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- Definition

The increase (decrease) in the fair value of servicing assets that are subsequently measured at fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

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