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Securities - Summary of Amortized Cost and Estimated Fair Values of Securities Held for Investment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 2,292	$ 4,365
Gross Unrealized Gains	13	42
Gross Unrealized Losses	(2)	(4)
Estimated Fair Value	2,303	4,403
Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	187	252
Gross Unrealized Gains	10	17
Estimated Fair Value	197	269
States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,605	3,613
Gross Unrealized Gains	3	25
Gross Unrealized Losses	(2)	(4)
Estimated Fair Value	1,606	3,634
Other Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	500	500
Estimated Fair Value	$ 500	$ 500

X

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

+ References

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