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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
Sep. 30, 2015
Dec. 31, 2014
Securities available for sale:    
Securities available-for-sale $ 53,895 $ 42,604 [1]
Mortgage servicing rights 642 596 [1]
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 2,741 2,897
Corporate Bonds    
Securities available for sale:    
Securities available-for-sale 700  
US Government Agencies    
Securities available for sale:    
Securities available-for-sale 23,136 16,965
State and Municipal Obligations    
Securities available for sale:    
Securities available-for-sale 24,562 23,401
Certificates of Deposit    
Securities available for sale:    
Securities available-for-sale 5,497 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 1,613 1,139
Equity Funds    
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 1,125 1,754
Fair Value, Inputs, Level 1    
Securities available for sale:    
Securities available-for-sale 1,428 845
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 2,741 2,897
Fair Value, Inputs, Level 1 | US Government Agencies    
Securities available for sale:    
Securities available-for-sale 1,428 845
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 1,613 1,139
Fair Value, Inputs, Level 1 | Equity Funds    
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 1,125 1,754
Fair Value, Inputs, Level 2    
Securities available for sale:    
Securities available-for-sale 51,519 41,759
Fair Value, Inputs, Level 2 | US Government Agencies    
Securities available for sale:    
Securities available-for-sale 21,708 16,120
Fair Value, Inputs, Level 2 | State and Municipal Obligations    
Securities available for sale:    
Securities available-for-sale 24,562 23,401
Fair Value, Inputs, Level 2 | Certificates of Deposit    
Securities available for sale:    
Securities available-for-sale 5,249 2,238
Fair Value, Inputs, Level 3    
Securities available for sale:    
Securities available-for-sale 948  
Mortgage servicing rights 642 $ 596
Fair Value, Inputs, Level 3 | Corporate Bonds    
Securities available for sale:    
Securities available-for-sale 700  
Fair Value, Inputs, Level 3 | Certificates of Deposit    
Securities available for sale:    
Securities available-for-sale $ 248  
[1] Derived from the audited consolidated financial statements.