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Fair Value Measurements - Schedule of Balances of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Securities available for sale:    
Securities available-for-sale $ 47,056 $ 42,604 [1]
Mortgage servicing rights 632 596 [1]
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 2,932 2,897
Corporate Bonds    
Securities available for sale:    
Securities available-for-sale 200  
US Government Agencies    
Securities available for sale:    
Securities available-for-sale 21,373 16,965
State and Municipal Obligations    
Securities available for sale:    
Securities available-for-sale 23,241 23,401
Certificates of Deposit    
Securities available for sale:    
Securities available-for-sale 2,242 2,238
Cash and Cash Equivalents    
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 3 4
Fixed Income Funds    
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 1,178 1,139
Equity Funds    
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 1,751 1,754
Fair Value, Inputs, Level 1    
Securities available for sale:    
Securities available-for-sale 1,366 845
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 2,932 2,897
Fair Value, Inputs, Level 1 | US Government Agencies    
Securities available for sale:    
Securities available-for-sale 1,366 845
Fair Value, Inputs, Level 1 | Cash and Cash Equivalents    
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 3 4
Fair Value, Inputs, Level 1 | Fixed Income Funds    
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 1,178 1,139
Fair Value, Inputs, Level 1 | Equity Funds    
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 1,751 1,754
Fair Value, Inputs, Level 2    
Securities available for sale:    
Securities available-for-sale 45,490 41,759
Fair Value, Inputs, Level 2 | US Government Agencies    
Securities available for sale:    
Securities available-for-sale 20,007 16,120
Fair Value, Inputs, Level 2 | State and Municipal Obligations    
Securities available for sale:    
Securities available-for-sale 23,241 23,401
Fair Value, Inputs, Level 2 | Certificates of Deposit    
Securities available for sale:    
Securities available-for-sale 2,242 2,238
Fair Value, Inputs, Level 3    
Securities available for sale:    
Securities available-for-sale 200  
Mortgage servicing rights 632 $ 596
Fair Value, Inputs, Level 3 | Corporate Bonds    
Securities available for sale:    
Securities available-for-sale $ 200  
[1] Derived from the audited consolidated financial statements.