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Servicing - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Transfers And Servicing [Abstract]
Loans serviced for others unpaid principal amount	$ 289.2	$ 288.6
Capitalized service right assets included in other assets	2.4	2.3
Fair market value of the capitalized servicing rights	$ 3.3	$ 3.1
Prepayment rate	8.90%	10.40%
Discount yield	6.60%	6.07%

X

- Definition

Capitalized service right assets fair market value.

+ References

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- Definition

Capitalized service right assets included in other assets.

+ References

No definition available.

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- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746

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- References

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