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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, 2019
Dec. 31, 2018
Available-for-sale securities:    
Available-for-sale securities $ 81,169 $ 82,232 [1]
Mortgage servicing rights 916 977 [1]
Fair Value, Measurements, Recurring    
Available-for-sale securities:    
Available-for-sale securities 81,169 82,232
Mortgage servicing rights 916 977
Rabbi trust assets 1,053 972
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Available-for-sale securities:    
Rabbi trust assets 1,053 972
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Available-for-sale securities:    
Available-for-sale securities 75,458 78,561
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Available-for-sale securities:    
Available-for-sale securities 5,711 3,671
Mortgage servicing rights 916 977
US Government Agencies and Mortgage Backed Securities    
Available-for-sale securities:    
Available-for-sale securities 51,867 49,882
US Government Agencies and Mortgage Backed Securities | Fair Value, Measurements, Recurring    
Available-for-sale securities:    
Available-for-sale securities 51,867 49,882
US Government Agencies and Mortgage Backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Available-for-sale securities:    
Available-for-sale securities 51,867 49,882
State and Municipal Obligations    
Available-for-sale securities:    
Available-for-sale securities 17,054 20,217
State and Municipal Obligations | Fair Value, Measurements, Recurring    
Available-for-sale securities:    
Available-for-sale securities 17,054 20,217
State and Municipal Obligations | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Available-for-sale securities:    
Available-for-sale securities 17,054 20,217
Corporate Bonds    
Available-for-sale securities:    
Available-for-sale securities 12,248 12,133
Corporate Bonds | Fair Value, Measurements, Recurring    
Available-for-sale securities:    
Available-for-sale securities 12,248 12,133
Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Available-for-sale securities:    
Available-for-sale securities 6,537 8,462
Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Available-for-sale securities:    
Available-for-sale securities $ 5,711 $ 3,671
[1] Derived from audited December 31, 2018 Consolidated Financial Statements.