Interest-Bearing Deposits - Summary of Interest - Bearing Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Interest Bearing Deposits [Line Items]
Total interest-bearing deposits	$ 409,588	$ 372,961
Interest-bearing Deposits [Member]
Interest Bearing Deposits [Line Items]
Demand	119,579	97,683
Savings	180,217	163,169
In excess of $250,000	12,026	13,102
Other	97,766	99,007
Total interest-bearing deposits	$ 409,588	$ 372,961

Interest Bearing Deposits [Line Items]

No definition available.

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- Definition

Time deposits 250000 or more domestic.

+ References

No definition available.

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- Definition

The aggregate of all domestic and foreign interest-bearing deposit liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Amount of money in interest-bearing domestic accounts that entitle the depositor to withdraw funds at any time without prior notice, also known as demand deposits.

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+ Details

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- Definition

Amount of interest-bearing domestic savings deposit liabilities. Saving deposits bear interest and have no stated maturity.

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+ Details

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- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations of less than $100,000.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section V
-Paragraph D-E

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