Fair Value Measurements - Schedule of Balances of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Securities available for sale:
Securities available-for-sale	$ 36,826	$ 38,522	[1]
Mortgage servicing rights	582	579	[1]
Defined benefit plan assets:
Defined Benefit Plan Fair Value Of Plan Assets	2,820	2,820
US Government Agencies
Securities available for sale:
Securities available-for-sale	10,007	9,308
State and Municipal Obligations
Securities available for sale:
Securities available-for-sale	24,825	26,557
Auction Rate Security
Securities available for sale:
Securities available-for-sale		912
Certificates of Deposit
Securities available for sale:
Securities available-for-sale	1,994	1,745
Cash and Cash Equivalents
Defined benefit plan assets:
Defined Benefit Plan Fair Value Of Plan Assets	3	3
Fixed Income Funds
Defined benefit plan assets:
Defined Benefit Plan Fair Value Of Plan Assets	1,070	1,070
Equity Funds
Defined benefit plan assets:
Defined Benefit Plan Fair Value Of Plan Assets	1,747	1,747
Fair Value, Inputs, Level 1
Defined benefit plan assets:
Defined Benefit Plan Fair Value Of Plan Assets	2,820	2,820
Fair Value, Inputs, Level 1 | Cash and Cash Equivalents
Defined benefit plan assets:
Defined Benefit Plan Fair Value Of Plan Assets	3	3
Fair Value, Inputs, Level 1 | Fixed Income Funds
Defined benefit plan assets:
Defined Benefit Plan Fair Value Of Plan Assets	1,070	1,070
Fair Value, Inputs, Level 1 | Equity Funds
Defined benefit plan assets:
Defined Benefit Plan Fair Value Of Plan Assets	1,747	1,747
Fair Value, Inputs, Level 2
Securities available for sale:
Securities available-for-sale	36,826	37,610
Fair Value, Inputs, Level 2 | US Government Agencies
Securities available for sale:
Securities available-for-sale	10,007	9,308
Fair Value, Inputs, Level 2 | State and Municipal Obligations
Securities available for sale:
Securities available-for-sale	24,825	26,557
Fair Value, Inputs, Level 2 | Certificates of Deposit
Securities available for sale:
Securities available-for-sale	1,994	1,745
Fair Value, Inputs, Level 3
Securities available for sale:
Securities available-for-sale		912
Mortgage servicing rights	582	579
Fair Value, Inputs, Level 3 | Auction Rate Security
Securities available for sale:
Securities available-for-sale		$ 912

[1] Derived from the audited consolidated financial statements.