Loans and Allowance - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - allowance for loan losses	$ 65,596	$ 66,224	$ 65,596	$ 66,224	$ 65,596	$ 68,367	$ 67,870	$ 68,202	$ 69,366
Decrease in allowance for loan losses					628
Allowance for impaired financing receivables change					1,895
Loans held for sale	6,423		6,423		6,423		5,331
Impaired financing receivable, allowance	3,370	1,475	3,370	1,475	3,370		1,583
Allowance for loan losses, write-offs	4,371
Allowance for loan losses, write-offs change					860
Provision for loan losses	1,600	1,533	1,600	5,632
Provision for loan losses, change					67
Real estate loans - Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - allowance for loan losses	14,207	14,706	14,207	14,706	14,207	14,928	15,077	15,113	14,157
Impaired financing receivable, allowance	484		484		484		6
Provision for loan losses	(424)	333	100	3,236
Real estate loans - Commercial and farm land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of troubled debt restructured loans			73.00%
Impaired financing receivable, allowance	$ 1,013		$ 1,013		$ 1,013		$ 894