Securities - Summary of Securities Available-for-Sale and Restricted Stock (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses		$ 132
Amortized cost, Held to maturity	36,808
Gross unrealized gains
Gross unrealized losses	1,118
Fair value, Held to maturity	35,690
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost, Equity	106	69
Gross unrealized gains	16	9
Gross unrealized losses	1	9
Fair value, Equity	121	69
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost, Debt	1,005	100
Gross unrealized gains
Gross unrealized losses	9
Fair value, Debt	996	100
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost, Debt	23,998	35,996
Gross unrealized gains	10	27
Gross unrealized losses	590	43
Fair value, Debt	23,418	35,980
Amortized cost, Held to maturity	15,169
Gross unrealized gains
Gross unrealized losses	583
Fair value, Held to maturity	14,586
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost, Debt	51,563	66,933
Gross unrealized gains	696	2,107
Gross unrealized losses	175	1
Fair value, Debt	52,084	69,039
Amortized cost, Held to maturity	21,639
Gross unrealized gains
Gross unrealized losses	535
Fair value, Held to maturity	21,104
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost, Debt	2,764	2,862
Gross unrealized gains	22
Gross unrealized losses		39
Fair value, Debt	2,786	2,823
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost, Debt	18,280	16,194
Gross unrealized gains	378	701
Gross unrealized losses	136	12
Fair value, Debt	18,522	16,883
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost, Debt	4,500	4,313
Gross unrealized gains	29	112
Gross unrealized losses	3	28
Fair value, Debt	4,526	4,397
Total Available-for-Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost, Debt	102,216	126,467
Gross unrealized gains	1,151	2,956
Gross unrealized losses	914	132
Fair value, Debt	102,453	129,291
Restricted Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost, Debt	5,463	5,463
Gross unrealized gains
Gross unrealized losses
Fair value, Debt	5,463	5,463
Total Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost, Debt	144,487	131,930
Gross unrealized gains	1,151	2,956
Gross unrealized losses	2,032	132
Fair value, Debt	$ 143,606	$ 134,754