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Fair Value Measurement - On a Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Available-for-sale securities:    
Available for sale securities $ 308,937  
Available-for-sale securities:   $ 309,191
Recurring    
Available-for-sale securities:    
Available for sale securities 308,937  
Available-for-sale securities:   309,191
Recurring | Level 1    
Available-for-sale securities:    
Available for sale securities 0  
Available-for-sale securities:   2,061
Recurring | Level 2    
Available-for-sale securities:    
Available for sale securities 308,937  
Available-for-sale securities:   307,130
Recurring | Level 3    
Available-for-sale securities:    
Available for sale securities 0  
Available-for-sale securities:   0
Nonrecurring    
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired loans 14,880 10,227
Loans held for sale   15,737
Other real estate 1,365 2,001
Assets held for sale 3,995 3,572
Nonrecurring | Level 1    
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired loans 0 0
Loans held for sale   0
Other real estate 0 0
Assets held for sale 0 0
Nonrecurring | Level 2    
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired loans 0 0
Loans held for sale   15,737
Other real estate 0 0
Assets held for sale 3,995 3,572
Nonrecurring | Level 3    
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired loans 14,880 10,227
Loans held for sale   0
Other real estate 1,365 2,001
Assets held for sale 0 0
Carrying Value    
Available-for-sale securities:    
Available for sale securities 308,937 309,191
Fair Value | Level 1    
Available-for-sale securities:    
Available for sale securities   2,061
Derivative Asset 0 0
Fair Value | Level 2    
Available-for-sale securities:    
Available for sale securities 308,937 307,130
Derivative Asset 1,477 1,078
Fair Value | Level 3    
Available-for-sale securities:    
Derivative Asset 0 0
Obligations of state and political subdivisions    
Available-for-sale securities:    
Available for sale securities 19,809  
Available-for-sale securities:   22,809
Obligations of state and political subdivisions | Recurring    
Available-for-sale securities:    
Available for sale securities 19,809  
Available-for-sale securities:   22,809
Obligations of state and political subdivisions | Recurring | Level 1    
Available-for-sale securities:    
Available for sale securities 0  
Available-for-sale securities:   0
Obligations of state and political subdivisions | Recurring | Level 2    
Available-for-sale securities:    
Available for sale securities 19,809  
Available-for-sale securities:   22,809
Obligations of state and political subdivisions | Recurring | Level 3    
Available-for-sale securities:    
Available for sale securities 0  
Available-for-sale securities:   0
GSE mortgage-backed securities    
Available-for-sale securities:    
Available for sale securities 52,518  
Available-for-sale securities:   59,124
GSE mortgage-backed securities | Recurring    
Available-for-sale securities:    
Available for sale securities 52,518  
Available-for-sale securities:   59,124
GSE mortgage-backed securities | Recurring | Level 1    
Available-for-sale securities:    
Available for sale securities 0  
Available-for-sale securities:   0
GSE mortgage-backed securities | Recurring | Level 2    
Available-for-sale securities:    
Available for sale securities 52,518  
Available-for-sale securities:   59,124
GSE mortgage-backed securities | Recurring | Level 3    
Available-for-sale securities:    
Available for sale securities 0  
Available-for-sale securities:   0
Collateralized mortgage obligations: residential    
Available-for-sale securities:    
Available for sale securities 208,714  
Available-for-sale securities:   198,155
Collateralized mortgage obligations: residential | Recurring    
Available-for-sale securities:    
Available for sale securities 208,714  
Available-for-sale securities:   198,155
Collateralized mortgage obligations: residential | Recurring | Level 1    
Available-for-sale securities:    
Available for sale securities 0  
Available-for-sale securities:   0
Collateralized mortgage obligations: residential | Recurring | Level 2    
Available-for-sale securities:    
Available for sale securities 208,714  
Available-for-sale securities:   198,155
Collateralized mortgage obligations: residential | Recurring | Level 3    
Available-for-sale securities:    
Available for sale securities 0  
Available-for-sale securities:   0
Collateralized mortgage obligations: commercial    
Available-for-sale securities:    
Available for sale securities 2,101  
Available-for-sale securities:   2,240
Collateralized mortgage obligations: commercial | Recurring    
Available-for-sale securities:    
Available for sale securities 2,101  
Available-for-sale securities:   2,240
Collateralized mortgage obligations: commercial | Recurring | Level 1    
Available-for-sale securities:    
Available for sale securities 0  
Available-for-sale securities:   0
Collateralized mortgage obligations: commercial | Recurring | Level 2    
Available-for-sale securities:    
Available for sale securities 2,101  
Available-for-sale securities:   2,240
Collateralized mortgage obligations: commercial | Recurring | Level 3    
Available-for-sale securities:    
Available for sale securities 0  
Available-for-sale securities:   0
Mutual funds    
Available-for-sale securities:    
Available-for-sale securities:   2,061
Mutual funds | Recurring    
Available-for-sale securities:    
Available-for-sale securities:   2,061
Mutual funds | Recurring | Level 1    
Available-for-sale securities:    
Available-for-sale securities:   2,061
Mutual funds | Recurring | Level 2    
Available-for-sale securities:    
Available-for-sale securities:   0
Mutual funds | Recurring | Level 3    
Available-for-sale securities:    
Available-for-sale securities:   0
Corporate debt securities    
Available-for-sale securities:    
Available for sale securities 25,795  
Available-for-sale securities:   24,802
Corporate debt securities | Recurring    
Available-for-sale securities:    
Available for sale securities 25,795  
Available-for-sale securities:   24,802
Corporate debt securities | Recurring | Level 1    
Available-for-sale securities:    
Available for sale securities 0  
Available-for-sale securities:   0
Corporate debt securities | Recurring | Level 2    
Available-for-sale securities:    
Available for sale securities 25,795  
Available-for-sale securities:   24,802
Corporate debt securities | Recurring | Level 3    
Available-for-sale securities:    
Available for sale securities $ 0  
Available-for-sale securities:   $ 0