Loans (Non-Accrual Loans by Loan Classification) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total nonaccrual loans	$ 390	$ 615
Land and land development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total nonaccrual loans	27	32
1-4 family residential, first lien, owner occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total nonaccrual loans		82
Student Loans Purchased [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total nonaccrual loans	363	445
Commercial and industrial - organic [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total nonaccrual loans		$ 56