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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
Mar. 31, 2016
Dec. 31, 2015
Securities available for sale:    
Securities available-for-sale $ 52,152 $ 54,090 [1]
Mortgage servicing rights 648 658 [1]
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 2,581 2,806
Corporate Bonds    
Securities available for sale:    
Securities available-for-sale 4,439 3,945
US Government Agencies    
Securities available for sale:    
Securities available-for-sale 20,878 21,288
State and Municipal Obligations    
Securities available for sale:    
Securities available-for-sale 26,835 28,857
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 1,026 1,119
Equity Funds    
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 1,552 1,684
Fair Value, Inputs, Level 1    
Securities available for sale:    
Securities available-for-sale 1,155 1,216
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 2,581 2,806
Fair Value, Inputs, Level 1 | US Government Agencies    
Securities available for sale:    
Securities available-for-sale 1,155 1,216
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 1,026 1,119
Fair Value, Inputs, Level 1 | Equity Funds    
Defined benefit plan assets:    
Defined Benefit Plan Fair Value Of Plan Assets 1,552 1,684
Fair Value, Inputs, Level 2    
Securities available for sale:    
Securities available-for-sale 46,558 48,929
Fair Value, Inputs, Level 2 | US Government Agencies    
Securities available for sale:    
Securities available-for-sale 19,723 20,072
Fair Value, Inputs, Level 2 | State and Municipal Obligations    
Securities available for sale:    
Securities available-for-sale 26,835 28,857
Fair Value, Inputs, Level 3    
Securities available for sale:    
Securities available-for-sale 4,439 3,945
Mortgage servicing rights 648 658
Fair Value, Inputs, Level 3 | Corporate Bonds    
Securities available for sale:    
Securities available-for-sale $ 4,439 $ 3,945
[1] Derived from Audited December 31, 2015 Financial Statements.