Securities - Summary of Securities Available-for-Sale and Restricted Stock (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	$ 121,093	$ 127,628
Gross Unrealized Gains, Available-for-sale	1,542	968
Gross Unrealized Losses, Available-for-sale	393	627
Fair Value, Available-for-sale	122,242	127,969
Amortized Cost, Held to maturity	27,025	33,819
Gross Unrealized Gains, Held to maturity	672	393
Gross Unrealized Losses, Held to maturity	37	201
Fair Value, Held to maturity	27,660	34,011
Amortized Cost	152,732	166,061
Gross Unrealized Gains	2,214	1,361
Gross Unrealized Losses	430	828
Fair Value	154,516	166,594
U.S. Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	13,000	18,239
Gross Unrealized Gains, Available-for-sale	9	5
Gross Unrealized Losses, Available-for-sale	6	126
Fair Value, Available-for-sale	13,003	18,118
Amortized Cost, Held to maturity	9,599	15,586
Gross Unrealized Gains, Held to maturity	390	312
Gross Unrealized Losses, Held to maturity		46
Fair Value, Held to maturity	9,989	15,852
Mortgage-Backed Securities of Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	60,532	62,930
Gross Unrealized Gains, Available-for-sale	929	527
Gross Unrealized Losses, Available-for-sale	141	278
Fair Value, Available-for-sale	61,320	63,179
Amortized Cost, Held to maturity	17,426	18,233
Gross Unrealized Gains, Held to maturity	282	81
Gross Unrealized Losses, Held to maturity	37	155
Fair Value, Held to maturity	17,671	18,159
U.S. Treasury Security [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	1,002	1,002
Gross Unrealized Losses, Available-for-sale		2
Fair Value, Available-for-sale	1,002	1,000
Other Mortgage-Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	95	104
Fair Value, Available-for-sale	95	104
Asset-Backed Securities of Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	1,424	1,464
Gross Unrealized Losses, Available-for-sale	85	72
Fair Value, Available-for-sale	1,339	1,392
State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	28,160	24,924
Gross Unrealized Gains, Available-for-sale	568	418
Gross Unrealized Losses, Available-for-sale	11	41
Fair Value, Available-for-sale	28,717	25,301
Corporate Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	16,827	18,912
Gross Unrealized Gains, Available-for-sale	24	7
Gross Unrealized Losses, Available-for-sale	150	108
Fair Value, Available-for-sale	16,701	18,811
Equity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	53	53
Gross Unrealized Gains, Available-for-sale	12	11
Fair Value, Available-for-sale	65	64
Restricted Stock [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	4,614	4,614
Fair Value	$ 4,614	$ 4,614

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Marketable Securities Fair Value

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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

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

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