Securities - Summary of Securities Available-for-Sale and Restricted Stock (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	$ 98,145	$ 102,253
Gross Unrealized Gains, Available-for-sale	1,143	1,023
Gross Unrealized Losses, Available-for-sale	452	1,554
Fair Value, Available-for-sale	98,836	101,722
Amortized Cost, Held to maturity	38,110	44,350
Gross Unrealized Gains, Held to maturity	313	0
Gross Unrealized Losses, Held to maturity	299	1,707
Fair Value, Held to maturity	38,124	42,643
Amortized Cost	140,869	152,066
Gross Unrealized Gains	1,456	1,023
Gross Unrealized Losses	751	3,261
Fair Value	141,574	149,828
Restricted Stock [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	4,614	5,463
Fair Value	4,614	5,463
U.S. Treasury Security [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	1,004	1,005
Gross Unrealized Gains, Available-for-sale	0	0
Gross Unrealized Losses, Available-for-sale	5	8
Fair Value, Available-for-sale	999	997
U.S. Government agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	23,200	22,999
Gross Unrealized Gains, Available-for-sale	11	8
Gross Unrealized Losses, Available-for-sale	227	706
Fair Value, Available-for-sale	22,984	22,301
Amortized Cost, Held to maturity	15,243	19,186
Gross Unrealized Gains, Held to maturity	145	0
Gross Unrealized Losses, Held to maturity	38	828
Fair Value, Held to maturity	15,350	18,358
Mortgage-backed securities of government agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	49,992	54,455
Gross Unrealized Gains, Available-for-sale	560	536
Gross Unrealized Losses, Available-for-sale	176	691
Fair Value, Available-for-sale	50,376	54,300
Amortized Cost, Held to maturity	22,867	25,164
Gross Unrealized Gains, Held to maturity	168	0
Gross Unrealized Losses, Held to maturity	261	879
Fair Value, Held to maturity	22,774	24,285
Other Mortgage-Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	174	230
Gross Unrealized Gains, Available-for-sale	3	5
Gross Unrealized Losses, Available-for-sale	0	0
Fair Value, Available-for-sale	177	235
Asset-backed securities of government agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	2,640	2,739
Gross Unrealized Gains, Available-for-sale	3	36
Gross Unrealized Losses, Available-for-sale	4	0
Fair Value, Available-for-sale	2,639	2,775
State and political subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	16,527	16,219
Gross Unrealized Gains, Available-for-sale	488	371
Gross Unrealized Losses, Available-for-sale	38	143
Fair Value, Available-for-sale	16,977	16,447
Corporate bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	4,502	4,500
Gross Unrealized Gains, Available-for-sale	55	44
Gross Unrealized Losses, Available-for-sale	2	5
Fair Value, Available-for-sale	4,555	4,539
Equity securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost, Available-for-sale	106	106
Gross Unrealized Gains, Available-for-sale	23	23
Gross Unrealized Losses, Available-for-sale	0	1
Fair Value, Available-for-sale	$ 129	$ 128