Loans and Related Allowance for Credit Losses (Nonaccrual Loans by Classes of the Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Financing receivable, recorded investment, nonaccrual status	$ 3,706	$ 3,688
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing receivable, recorded investment, nonaccrual status	19
Commercial Loan [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing receivable, recorded investment, nonaccrual status	1,281	1,286
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing receivable, recorded investment, nonaccrual status	$ 2,406	$ 2,402