Fair Value Measurement - By Balance Sheet Grouping and Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 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	$ 348,580	$ 348,580	$ 341,873
Securities held-to-maturity	88,460	88,460	98,261
Financial liabilities [Abstract]
Long-term Federal Home Loan Bank advances	25,211	25,211	25,424
Carrying Value
Financial assets [Abstract]
Cash and due from banks, interest-bearing deposits in banks and federal funds sold	131,437	131,437	82,228
Securities available-for-sale	348,580	348,580	341,873
Securities held-to-maturity	87,462	87,462	98,211
Other investments	11,666	11,666	11,355
Loans, net	1,215,579	1,215,579	1,259,710
Cash surrender value of life insurance policies	14,764	14,764	14,335
Financial liabilities [Abstract]
Non-interest-bearing deposits	428,419	428,419	414,921
Interest-bearing deposits	1,107,801	1,107,801	1,164,509
Securities sold under agreements to repurchase	90,799	90,799	94,461
Long-term Federal Home Loan Bank advances	25,211	25,211	25,424
Junior subordinated debentures	22,167	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	131,437	131,437	82,228
Securities available-for-sale			2,059
Securities held-to-maturity	0	0	0
Other investments	11,666	11,666	11,355
Loans, net	0	0	0
Cash surrender value of life insurance policies	0	0	0
Derivative Asset	0	0	0
Financial liabilities [Abstract]
Non-interest-bearing deposits	0	0	0
Interest-bearing deposits	0	0	0
Securities sold under agreements to repurchase	90,799	90,799	94,461
Long-term Federal Home Loan Bank advances	0	0	0
Junior subordinated debentures	0	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	0
Securities available-for-sale	346,503	346,503	339,814
Securities held-to-maturity	88,460	88,460	98,261
Other investments	0	0	0
Loans, net	23,676	23,676	26,956
Cash surrender value of life insurance policies	14,764	14,764	14,335
Derivative Asset	865	865	989
Financial liabilities [Abstract]
Non-interest-bearing deposits	428,419	428,419	414,921
Interest-bearing deposits	959,827	959,827	1,012,633
Securities sold under agreements to repurchase	0	0	0
Long-term Federal Home Loan Bank advances	25,408	25,408	25,808
Junior subordinated debentures	22,167	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	0
Securities available-for-sale	0	0	0
Securities held-to-maturity	0	0	0
Other investments	0	0	0
Loans, net	1,198,600	1,198,600	1,236,133
Cash surrender value of life insurance policies	0	0	0
Derivative Asset	0	0	0
Financial liabilities [Abstract]
Non-interest-bearing deposits	0	0	0
Interest-bearing deposits	146,720	146,720	150,879
Securities sold under agreements to repurchase	0	0	0
Long-term Federal Home Loan Bank advances	0	0	0
Junior subordinated debentures	$ 0	$ 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