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Fair Value Measurement - Limitations (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financial assets [Abstract]    
Securities available-for-sale $ 318,239 $ 318,159
Securities held-to-maturity 112,273 117,698
Financial liabilities [Abstract]    
Long-term Federal Home Loan Bank advances 25,638 25,851
Carrying Value    
Financial assets [Abstract]    
Cash and due from banks, interest-bearing deposits in banks and federal funds sold 98,535 89,201
Securities available-for-sale 318,239 318,159
Securities held-to-maturity 109,420 116,792
Other investments 11,036 11,188
Loans, net 1,241,011 1,244,634
Cash surrender value of life insurance policies 14,167 13,622
Financial liabilities [Abstract]    
Non-interest-bearing deposits 383,797 374,261
Interest-bearing deposits 1,176,269 1,176,589
Securities sold under agreements to repurchase 85,786 85,957
Short-term Federal Home Loan Bank advances   25,000
Long-term Federal Home Loan Bank advances 25,638 25,851
Junior subordinated debentures 22,167 22,167
Fair Value | Level 1    
Financial assets [Abstract]    
Cash and due from banks, interest-bearing deposits in banks and federal funds sold 98,535 89,201
Securities available-for-sale 2,135 2,092
Securities held-to-maturity 0 0
Other investments 11,036 11,188
Loans, net 0 0
Cash surrender value of life insurance policies 0 0
Financial liabilities [Abstract]    
Non-interest-bearing deposits 0 0
Interest-bearing deposits 0 0
Securities sold under agreements to repurchase 85,786 85,957
Short-term Federal Home Loan Bank advances   0
Long-term Federal Home Loan Bank advances 0 0
Junior subordinated debentures 0 0
Fair Value | Level 2    
Financial assets [Abstract]    
Cash and due from banks, interest-bearing deposits in banks and federal funds sold 0 0
Securities available-for-sale 316,104 316,067
Securities held-to-maturity 112,273 117,698
Other investments 0 0
Loans, net 19,474 17,487
Cash surrender value of life insurance policies 14,167 13,622
Financial liabilities [Abstract]    
Non-interest-bearing deposits 383,797 374,261
Interest-bearing deposits 1,013,360 1,007,137
Securities sold under agreements to repurchase 0 0
Short-term Federal Home Loan Bank advances   25,000
Long-term Federal Home Loan Bank advances 0 0
Junior subordinated debentures 22,167 22,167
Fair Value | Level 3    
Financial assets [Abstract]    
Cash and due from banks, interest-bearing deposits in banks and federal funds sold 0 0
Securities available-for-sale 0 0
Securities held-to-maturity 0 0
Other investments 0 0
Loans, net 1,228,352 1,232,497
Cash surrender value of life insurance policies 0 0
Financial liabilities [Abstract]    
Non-interest-bearing deposits 0 0
Interest-bearing deposits 162,694 168,633
Securities sold under agreements to repurchase 0 0
Short-term Federal Home Loan Bank advances   0
Long-term Federal Home Loan Bank advances 26,408 26,508
Junior subordinated debentures $ 0 $ 0