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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 196,161	$ 221,514
Gross Unrealized Gains	1,032	823
Gross Unrealized Losses	(1,611)	(3,810)
Fair Value	195,582	218,527
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,824	24,920
Gross Unrealized Gains		1
Gross Unrealized Losses	(107)	(146)
Fair Value	15,717	24,775
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	79,238	84,266
Gross Unrealized Gains	3	3
Gross Unrealized Losses	(883)	(1,795)
Fair Value	78,358	82,474
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	44,527	49,155
Gross Unrealized Gains	182	185
Gross Unrealized Losses	(475)	(879)
Fair Value	44,234	48,461
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	56,572	63,173
Gross Unrealized Gains	847	634
Gross Unrealized Losses	(146)	(990)
Fair Value	$ 57,273	$ 62,817

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
-Subparagraph (b)
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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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