Fair Value Measurements - Schedule of Quantitative Information of Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Impaired Loans [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Level III [Member] \| Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Estimate	$ 5,331	$ 7,256
Level III [Member] \| Appraisal of Collateral [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Estimate	1,097	1,079
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Estimate	6,427	8,335
Fair Value, Measurements, Nonrecurring [Member] \| Level III [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Estimate	$ 6,427	$ 8,335
Fair Value, Measurements, Nonrecurring [Member] \| Level III [Member] \| Discounted Cash Flow [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Remaining term	6 months	2 months
Discount rate	3.10%	3.10%
Fair Value, Measurements, Nonrecurring [Member] \| Level III [Member] \| Discounted Cash Flow [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Remaining term	29 years 10 months 24 days	2 years 11 months 12 days
Discount rate	12.00%	8.30%
Fair Value, Measurements, Nonrecurring [Member] \| Level III [Member] \| Discounted Cash Flow [Member] \| Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Remaining term	61 months 3 days	55 months
Discount rate	4.90%	4.30%
Fair Value, Measurements, Nonrecurring [Member] \| Level III [Member] \| Appraisal of Collateral [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidation expense	(10.00%)	(10.00%)
Fair Value, Measurements, Nonrecurring [Member] \| Level III [Member] \| Appraisal of Collateral [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraisal adjustments	0.00%	(20.00%)
Fair Value, Measurements, Nonrecurring [Member] \| Level III [Member] \| Appraisal of Collateral [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraisal adjustments	(50.00%)	(30.00%)
Fair Value, Measurements, Nonrecurring [Member] \| Level III [Member] \| Appraisal of Collateral [Member] \| Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraisal adjustments	(21.70%)	(26.00%)

Fair value inputs liquidation expense.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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

+ Details

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

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

+ Details

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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

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