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Fair Value Measurement - Limitations (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financial assets [Abstract]    
Securities available-for-sale $ 285,485 $ 276,984
Securities held-to-maturity 122,488 141,593
Financial liabilities [Abstract]    
Long-term Federal Home Loan Bank advances 25,958 26,277
Carrying Value    
Financial assets [Abstract]    
Cash and due from banks, interest-bearing deposits in banks and federal funds sold 125,437 86,872
Securities available-for-sale 285,485 276,984
Securities held-to-maturity 121,043 141,201
Other investments 12,063 9,990
Loans, net 1,282,513 1,273,205
Cash surrender value of life insurance policies 13,548 13,659
Financial liabilities [Abstract]    
Non-interest-bearing deposits 406,118 390,863
Interest-bearing deposits 1,137,303 1,194,371
Securities sold under agreements to repurchase 92,085 62,098
Short-term Federal Home Loan Bank advances 70,000 25,000
Long-term Federal Home Loan Bank advances 25,958 26,277
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 125,437 86,872
Securities available-for-sale 2,116 2,104
Securities held-to-maturity 0 0
Other investments 12,063 9,990
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 92,085 62,098
Short-term Federal Home Loan Bank advances 0 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 283,369 274,880
Securities held-to-maturity 122,488 141,593
Other investments 0 0
Loans, net 14,966 5,051
Cash surrender value of life insurance policies 13,548 13,659
Financial liabilities [Abstract]    
Non-interest-bearing deposits 406,118 390,863
Interest-bearing deposits 918,792 943,255
Securities sold under agreements to repurchase 0 0
Short-term Federal Home Loan Bank advances 70,000 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 1,282,506 1,277,882
Cash surrender value of life insurance policies 0 0
Financial liabilities [Abstract]    
Non-interest-bearing deposits 0 0
Interest-bearing deposits 218,328 251,291
Securities sold under agreements to repurchase 0 0
Short-term Federal Home Loan Bank advances 0 0
Long-term Federal Home Loan Bank advances 26,956 27,193
Junior subordinated debentures $ 0 $ 0