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Fair Value Measurement - On a Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Available-for-sale securities:    
Total available-for-sale securities $ 348,580 $ 341,873
Recurring    
Available-for-sale securities:    
Obligations of state and political subdivisions 24,835 29,141
GSE mortgage-backed securities 76,740 73,578
Collateralized mortgage obligations: residential 220,672 220,202
Collateralized mortgage obligations: commercial 2,549 3,082
Mutual funds 2,077 2,059
Corporate debt securities 21,707 13,811
Total available-for-sale securities 348,580 341,873
Recurring | Level 1    
Available-for-sale securities:    
Obligations of state and political subdivisions 0 0
GSE mortgage-backed securities 0 0
Collateralized mortgage obligations: residential 0 0
Collateralized mortgage obligations: commercial 0 0
Mutual funds 2,077 2,059
Corporate debt securities 0 0
Total available-for-sale securities 2,077 2,059
Recurring | Level 2    
Available-for-sale securities:    
Obligations of state and political subdivisions 24,835 29,141
GSE mortgage-backed securities 76,740 73,578
Collateralized mortgage obligations: residential 220,672 220,202
Collateralized mortgage obligations: commercial 2,549 3,082
Mutual funds 0 0
Corporate debt securities 21,707 13,811
Total available-for-sale securities 346,503 339,814
Recurring | Level 3    
Available-for-sale securities:    
Obligations of state and political subdivisions 0 0
GSE mortgage-backed securities 0 0
Collateralized mortgage obligations: residential 0 0
Collateralized mortgage obligations: commercial 0 0
Mutual funds 0 0
Corporate debt securities 0 0
Total available-for-sale securities 0 0
Nonrecurring    
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired loans 23,676 26,956
Other real estate 1,387 2,175
Nonrecurring | Level 1    
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired loans 0 0
Other real estate 0 0
Nonrecurring | Level 2    
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired loans 0 0
Other real estate 0 0
Nonrecurring | Level 3    
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired loans 23,676 26,956
Other real estate 1,387 2,175
Carrying Value    
Available-for-sale securities:    
Total available-for-sale securities 348,580 341,873
Fair Value | Level 1    
Available-for-sale securities:    
Total available-for-sale securities   2,059
Derivative Asset 0 0
Fair Value | Level 2    
Available-for-sale securities:    
Total available-for-sale securities 346,503 339,814
Derivative Asset 865 989
Fair Value | Level 3    
Available-for-sale securities:    
Total available-for-sale securities 0 0
Derivative Asset $ 0 $ 0