Loans (Schedule of Troubled Debt Restructurings) (Details) $ in Thousands	Jun. 30, 2019 USD ($) item	Dec. 31, 2018 USD ($) item
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | item	70	69
Total Troubled Debt Restructurings | $	$ 2,148	$ 2,230
Performing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | item	69	67
Total Troubled Debt Restructurings | $	$ 2,132	$ 2,207
Performing [Member] | 1-4 family residential, junior lien [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | item		1
Total Troubled Debt Restructurings | $		$ 127
Performing [Member] | Commercial non-owner occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | item	1	1
Total Troubled Debt Restructurings | $	$ 903	$ 923
Performing [Member] | Student Loans Purchased [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | item	68	65
Total Troubled Debt Restructurings | $	$ 1,229	$ 1,157
Nonperforming [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | item	1	2
Total Troubled Debt Restructurings | $	$ 16	$ 23
Nonperforming [Member] | Student Loans Purchased [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | item		1
Total Troubled Debt Restructurings | $		$ 4
Nonperforming [Member] | Land and land development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | item	1	1
Total Troubled Debt Restructurings | $	$ 16	$ 19