Fair Value Measurement - By Balance Sheet Grouping and Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount for selling costs	10.00%
Financial assets [Abstract]
Securities available-for-sale	$ 357,803	$ 341,873
Securities held-to-maturity	91,767	98,261
Financial liabilities [Abstract]
Long-term Federal Home Loan Bank advances	25,318	25,424
Carrying Value
Financial assets [Abstract]
Cash and due from banks, interest-bearing deposits in banks and federal funds sold	78,471	82,228
Securities available-for-sale	357,803	341,873
Securities held-to-maturity	91,242	98,211
Other investments	11,362	11,355
Loans, net	1,247,422	1,259,710
Cash surrender value of life insurance policies	14,398	14,335
Derivative Asset	1,002	989
Financial liabilities [Abstract]
Non-interest-bearing deposits	426,998	414,921
Interest-bearing deposits	1,145,946	1,164,509
Securities sold under agreements to repurchase	89,807	94,461
Long-term Federal Home Loan Bank advances	25,318	25,424
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	78,471	82,228
Securities available-for-sale		2,059
Securities held-to-maturity	0	0
Other investments	11,362	11,355
Loans, net	0	0
Cash surrender value of life insurance policies	0	0
Derivative Asset	0	0
Financial liabilities [Abstract]
Non-interest-bearing deposits	0	0
Interest-bearing deposits	0	0
Securities sold under agreements to repurchase	89,807	94,461
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	355,744	339,814
Securities held-to-maturity	91,767	98,261
Other investments	0	0
Loans, net	27,051	26,956
Cash surrender value of life insurance policies	14,398	14,335
Derivative Asset	1,002	989
Financial liabilities [Abstract]
Non-interest-bearing deposits	426,998	414,921
Interest-bearing deposits	996,201	1,012,633
Securities sold under agreements to repurchase	0	0
Long-term Federal Home Loan Bank advances	25,614	25,808
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	1,225,251	1,236,133
Cash surrender value of life insurance policies	0	0
Derivative Asset	0	0
Financial liabilities [Abstract]
Non-interest-bearing deposits	0	0
Interest-bearing deposits	148,598	150,879
Securities sold under agreements to repurchase	0	0
Long-term Federal Home Loan Bank advances	0	0
Junior subordinated debentures	$ 0	$ 0
Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Period when new appraisals are received	28 days
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Period when new appraisals are received	42 days