Loans and Allowance - Summary of Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) loan	Sep. 30, 2014 USD ($) loan	Sep. 30, 2015 USD ($) loan	Sep. 30, 2014 USD ($) loan
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	$ 1,357	$ 485	$ 5,765	$ 1,047
Post-Modification Recorded Balance	$ 1,217	$ 492	$ 6,370	$ 1,056
Number of Loans | loan	5	12	16	20
Commercial and industrial loans
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	$ 363		$ 4,111
Post-Modification Recorded Balance	$ 218		$ 2,115
Number of Loans | loan	2		7
Real estate loans - Construction
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance			$ 79
Post-Modification Recorded Balance			$ 80
Number of Loans | loan			1
Real estate loans - Commercial and farmland
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	$ 744		$ 1,281	$ 259
Post-Modification Recorded Balance	$ 744		$ 3,025	$ 259
Number of Loans | loan	1		3	1
Real estate loans - Residential
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	$ 11	$ 256	$ 55	$ 448
Post-Modification Recorded Balance	$ 13	$ 245	$ 908	$ 428
Number of Loans | loan	1	5	4	7
Real estate loans - Home Equity
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	$ 239	$ 229	$ 239	$ 314
Post-Modification Recorded Balance	$ 242	$ 247	$ 242	$ 343
Number of Loans | loan	1	7	1	10
Individuals' loans for household and other personal expenditures
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance				$ 26
Post-Modification Recorded Balance				$ 26
Number of Loans | loan				2