Loans and Allowance - Summary of Troubled Debt Restructurings by Modification (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financing Receivable, Modifications [Line Items]
Modification	$ 523	$ 4,049	$ 668	$ 4,561
Troubled Debt Restructurings, Term Modifications
Financing Receivable, Modifications [Line Items]
Modification	367	36	367	60
Troubled Debt Restructurings Rate Modifications
Financing Receivable, Modifications [Line Items]
Modification	23	100	154	100
Troubled Debt Restructurings, Combination
Financing Receivable, Modifications [Line Items]
Modification	133	3,913	147	4,401
Commercial and industrial loans
Financing Receivable, Modifications [Line Items]
Modification		36		126
Commercial and industrial loans | Troubled Debt Restructurings, Term Modifications
Financing Receivable, Modifications [Line Items]
Modification		36		60
Commercial and industrial loans | Troubled Debt Restructurings, Combination
Financing Receivable, Modifications [Line Items]
Modification				66
Real estate loans - Commercial and farm land
Financing Receivable, Modifications [Line Items]
Modification	272	3,549	272	3,935
Real estate loans - Commercial and farm land | Troubled Debt Restructurings, Term Modifications
Financing Receivable, Modifications [Line Items]
Modification	272		272
Real estate loans - Commercial and farm land | Troubled Debt Restructurings, Combination
Financing Receivable, Modifications [Line Items]
Modification		3,549		3,935
Real estate loans - Residential
Financing Receivable, Modifications [Line Items]
Modification	217	419	277	455
Real estate loans - Residential | Troubled Debt Restructurings, Term Modifications
Financing Receivable, Modifications [Line Items]
Modification	95		95
Real estate loans - Residential | Troubled Debt Restructurings Rate Modifications
Financing Receivable, Modifications [Line Items]
Modification		100	60	100
Real estate loans - Residential | Troubled Debt Restructurings, Combination
Financing Receivable, Modifications [Line Items]
Modification	122	319	122	355
Real estate loans - Home equity
Financing Receivable, Modifications [Line Items]
Modification	23		94
Real estate loans - Home equity | Troubled Debt Restructurings Rate Modifications
Financing Receivable, Modifications [Line Items]
Modification	23		94
Individuals' loans for household and other personal expenditures
Financing Receivable, Modifications [Line Items]
Modification	11	45	25	45
Individuals' loans for household and other personal expenditures | Troubled Debt Restructurings Rate Modifications
Financing Receivable, Modifications [Line Items]
Modification
Individuals' loans for household and other personal expenditures | Troubled Debt Restructurings, Combination
Financing Receivable, Modifications [Line Items]
Modification	$ 11	$ 45	$ 25	$ 45