Impaired Loans and Valuation Allowance for Loan Losses - Company's Recorded Investments in Impaired Loans and the Related Valuation Allowances (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Recorded Investment
Total	$ 47,911	$ 52,969
Unpaid Principal Balance
Total	55,888	62,446
Related Valuation Allowance
Total	4,436	5,446
Construction Land Development [Member]
Recorded Investment
Impaired Financing Receivable, with No Related Allowance, Recorded	1,847	2,561
Impaired Financing Receivable, with Related Allowance, Recorded	1,237	1,120
Total	3,084	3,681
Unpaid Principal Balance
Impaired Financing Receivable, with No Related Allowance Recorded	2,274	3,180
Impaired Financing Receivable, with Related Allowance Recorded	1,636	1,197
Total	3,910	4,377
Related Valuation Allowance
Impaired Financing Receivable With No Related Allowance Recorded	0	0
Impaired Financing Receivable With Related Allowance Recorded	372	149
Total	372	149
Commercial Real Estate [Member]
Recorded Investment
Impaired Financing Receivable, with No Related Allowance, Recorded	2,951	4,481
Impaired Financing Receivable, with Related Allowance, Recorded	11,234	7,937
Total	14,185	12,418
Unpaid Principal Balance
Impaired Financing Receivable, with No Related Allowance Recorded	4,552	6,577
Impaired Financing Receivable, with Related Allowance Recorded	11,345	8,046
Total	15,897	14,623
Related Valuation Allowance
Impaired Financing Receivable With No Related Allowance Recorded	0	0
Impaired Financing Receivable With Related Allowance Recorded	662	638
Total	662	638
Residential Real Estate [Member]
Recorded Investment
Impaired Financing Receivable, with No Related Allowance, Recorded	10,148	12,366
Impaired Financing Receivable, with Related Allowance, Recorded	19,522	23,365
Total	29,670	35,731
Unpaid Principal Balance
Impaired Financing Receivable, with No Related Allowance Recorded	14,475	17,372
Impaired Financing Receivable, with Related Allowance Recorded	20,536	24,766
Total	35,011	42,138
Related Valuation Allowance
Impaired Financing Receivable With No Related Allowance Recorded	0	0
Impaired Financing Receivable With Related Allowance Recorded	3,279	4,528
Total	3,279	4,528
Commercial And Financial [Member]
Recorded Investment
Impaired Financing Receivable, with No Related Allowance, Recorded	148	153
Impaired Financing Receivable, with Related Allowance, Recorded	8	13
Total	156	166
Unpaid Principal Balance
Impaired Financing Receivable, with No Related Allowance Recorded	148	153
Impaired Financing Receivable, with Related Allowance Recorded	8	13
Total	156	166
Related Valuation Allowance
Impaired Financing Receivable With No Related Allowance Recorded	0	0
Impaired Financing Receivable With Related Allowance Recorded	8	13
Total	8	13
Consumer [Member]
Recorded Investment
Impaired Financing Receivable, with No Related Allowance, Recorded	268	425
Impaired Financing Receivable, with Related Allowance, Recorded	548	548
Total	816	973
Unpaid Principal Balance
Impaired Financing Receivable, with No Related Allowance Recorded	316	569
Impaired Financing Receivable, with Related Allowance Recorded	598	573
Total	914	1,142
Related Valuation Allowance
Impaired Financing Receivable With No Related Allowance Recorded	0	0
Impaired Financing Receivable With Related Allowance Recorded	115	118
Total	$ 115	$ 118