Fair Value Measurement - Limitations (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financial assets [Abstract]
Securities available-for-sale	$ 300,335	$ 276,984
Securities held-to-maturity	126,849	141,593
Financial liabilities [Abstract]
Long-term Federal Home Loan Bank advances	26,064	26,277
Carrying Value
Financial assets [Abstract]
Cash and due from banks, interest-bearing deposits in banks and federal funds sold	82,636	86,872
Securities available-for-sale	300,335	276,984
Securities held-to-maturity	126,529	141,201
Other investments	10,598	9,990
Loans, net	1,278,344	1,273,205
Cash surrender value of life insurance policies	13,473	13,659
Financial liabilities [Abstract]
Non-interest-bearing deposits	408,742	390,863
Interest-bearing deposits	1,149,508	1,194,371
Securities sold under agreements to repurchase	84,547	62,098
Short-term Federal Home Loan Bank advances	40,000	25,000
Long-term Federal Home Loan Bank advances	26,064	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	82,636	86,872
Securities available-for-sale	2,096	2,104
Securities held-to-maturity	0	0
Other investments	10,598	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	84,547	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	298,239	274,880
Securities held-to-maturity	126,849	141,593
Other investments	0	0
Loans, net	12,177	5,051
Cash surrender value of life insurance policies	13,473	13,659
Financial liabilities [Abstract]
Non-interest-bearing deposits	408,742	390,863
Interest-bearing deposits	913,432	943,255
Securities sold under agreements to repurchase	0	0
Short-term Federal Home Loan Bank advances	40,000	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	1,274,834	1,277,882
Cash surrender value of life insurance policies	0	0
Financial liabilities [Abstract]
Non-interest-bearing deposits	0	0
Interest-bearing deposits	235,945	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	27,019	27,193
Junior subordinated debentures	$ 0	$ 0