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Servicing - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Transfers and Servicing [Abstract]
Loans serviced for others unpaid principal amount	$ 275.6	$ 275.5
Capitalized service right assets included in other assets	2.1	2.0
Fair market value of the capitalized servicing rights	$ 2.7	$ 2.9
Prepayment rate	11.00%	9.60%
Discount yield	6.52%	6.48%

X

- Definition

Capitalized service right assets fair market value.

+ References

No definition available.

+ Details

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X

- Definition

Capitalized service right assets included in other assets.

+ References

No definition available.

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X

- Definition

Loans serviced for others unpaid principal amount.

+ References

No definition available.

+ Details

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X

- Definition

Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122596-111746

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X

- Definition

Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122596-111746

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- References

No definition available.

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