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Fair Value Measurement - On a Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Available-for-sale securities:    
Total available-for-sale securities $ 326,222 $ 341,873
Recurring    
Available-for-sale securities:    
Obligations of state and political subdivisions 23,810 29,141
GSE mortgage-backed securities 62,860 73,578
Collateralized mortgage obligations: residential 210,209 220,202
Collateralized mortgage obligations: commercial 2,472 3,082
Mutual funds 2,079 2,059
Corporate debt securities 24,792 13,811
Total available-for-sale securities 326,222 341,873
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 2,079 2,059
Corporate debt securities 0 0
Total available-for-sale securities 2,079 2,059
Recurring | Level 2    
Available-for-sale securities:    
Obligations of state and political subdivisions 23,810 29,141
GSE mortgage-backed securities 62,860 73,578
Collateralized mortgage obligations: residential 210,209 220,202
Collateralized mortgage obligations: commercial 2,472 3,082
Mutual funds 0 0
Corporate debt securities 24,792 13,811
Total available-for-sale securities 324,143 339,814
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 19,561 26,956
Other real estate 1,931 2,175
Assets held for sale 1,100  
Nonrecurring | Level 1    
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired loans 0 0
Other real estate 0 0
Assets held for sale 0  
Nonrecurring | Level 2    
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired loans 0 0
Other real estate 0 0
Assets held for sale 1,100  
Nonrecurring | Level 3    
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired loans 19,561 26,956
Other real estate 1,931 2,175
Assets held for sale 0  
Carrying Value    
Available-for-sale securities:    
Total available-for-sale securities 326,222 341,873
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 324,143 339,814
Derivative Asset 855 989
Fair Value | Level 3    
Available-for-sale securities:    
Total available-for-sale securities 0 0
Derivative Asset $ 0 $ 0