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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 208,994	$ 221,514
Gross Unrealized Gains	807	823
Gross Unrealized Losses	(3,413)	(3,810)
Fair Value	206,388	218,527
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19,872	24,920
Gross Unrealized Gains		1
Gross Unrealized Losses	(137)	(146)
Fair Value	19,735	24,775
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	84,252	84,266
Gross Unrealized Gains		3
Gross Unrealized Losses	(1,612)	(1,795)
Fair Value	82,640	82,474
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	46,728	49,155
Gross Unrealized Gains	181	185
Gross Unrealized Losses	(866)	(879)
Fair Value	46,043	48,461
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	58,142	63,173
Gross Unrealized Gains	626	634
Gross Unrealized Losses	(798)	(990)
Fair Value	$ 57,970	$ 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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