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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 198,096	$ 199,165
Gross Unrealized Gains	387	501
Gross Unrealized Losses	(5,624)	(3,268)
Fair Value	192,859	196,398
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,193	21,219
Gross Unrealized Losses	(354)	(241)
Fair Value	20,839	20,978
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	82,184	82,198
Gross Unrealized Losses	(2,691)	(1,732)
Fair Value	79,493	80,466
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,283	40,236
Gross Unrealized Gains	30	64
Gross Unrealized Losses	(1,451)	(790)
Fair Value	36,862	39,510
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	56,436	55,512
Gross Unrealized Gains	357	437
Gross Unrealized Losses	(1,128)	(505)
Fair Value	$ 55,665	$ 55,444

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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