Troubled Debt Restructuring (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	$ 2,249	$ 1,601
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	1,022	3,222
Impaired Financing Receivable, Trouble Debt Structuring, Total	3,271	4,823
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	194	260
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modification, Number of Contracts	2	8	14
Financing Receivable, Modification, Pre-Modification Recorded Investment	1,302	3,330	11,819
Financing Receivable, Modifications, Post-Modifications Recorded Investment	1,304	3,326	9,608
Financing Receivable, Modifications, Subsequent Default [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	272	1,622	2,386
Commercial and Industrial Loans [Member]
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	70	124
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	0	0
Impaired Financing Receivable, Trouble Debt Structuring, Total	70	124
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	0	0
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modification, Number of Contracts			0
Financing Receivable, Modification, Pre-Modification Recorded Investment			0
Financing Receivable, Modifications, Post-Modifications Recorded Investment			0
Construction And Land Development Loans [Member]
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	0	0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	605	1,582
Impaired Financing Receivable, Trouble Debt Structuring, Total	605	1,582
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	0	88
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modification, Number of Contracts		1	4
Financing Receivable, Modification, Pre-Modification Recorded Investment		390	5,419
Financing Receivable, Modifications, Post-Modifications Recorded Investment		387	4,305
Financing Receivable, Modifications, Subsequent Default [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1,197	2,386
Commercial Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	846	875
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	263	285
Impaired Financing Receivable, Trouble Debt Structuring, Total	1,109	1,160
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	102	110
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modification, Number of Contracts		1	4
Financing Receivable, Modification, Pre-Modification Recorded Investment		882	3,167
Financing Receivable, Modifications, Post-Modifications Recorded Investment		882	2,225
Financing Receivable, Modifications, Subsequent Default [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	272
Commercial Real Estate Other Loans [Member]
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	591	602
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	0	429
Impaired Financing Receivable, Trouble Debt Structuring, Total	591	1,031
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	92	62
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modification, Number of Contracts	1	2	2
Financing Receivable, Modification, Pre-Modification Recorded Investment	590	1,037	1,803
Financing Receivable, Modifications, Post-Modifications Recorded Investment	592	1,041	1,657
Financing Receivable, Modifications, Subsequent Default [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		425
Commercial Real Estate Loans, Total [Member]
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	1,437	1,477
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	263	714
Impaired Financing Receivable, Trouble Debt Structuring, Total	1,700	2,191
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	194	172
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modification, Number of Contracts	1	3	6
Financing Receivable, Modification, Pre-Modification Recorded Investment	590	1,919	4,970
Financing Receivable, Modifications, Post-Modifications Recorded Investment	592	1,923	3,882
Financing Receivable, Modifications, Subsequent Default [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	272	425
Residential Real Estate Consumer Mortgage Loans [Member]
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	742	0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	0	754
Impaired Financing Receivable, Trouble Debt Structuring, Total	742	754
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	0	0
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modification, Number of Contracts	1	3
Financing Receivable, Modification, Pre-Modification Recorded Investment	712	849
Financing Receivable, Modifications, Post-Modifications Recorded Investment	712	844
Residential Real Estate Investment Property Loans [Member]
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	0	0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	154	172
Impaired Financing Receivable, Trouble Debt Structuring, Total	154	172
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	0	0
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modification, Number of Contracts		1	2
Financing Receivable, Modification, Pre-Modification Recorded Investment		172	567
Financing Receivable, Modifications, Post-Modifications Recorded Investment		172	563
Residential Real Estate Loans, Total [Member]
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	742	0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	154	926
Impaired Financing Receivable, Trouble Debt Structuring, Total	896	926
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	0	0
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modification, Number of Contracts	1	4	4
Financing Receivable, Modification, Pre-Modification Recorded Investment	712	1,021	1,430
Financing Receivable, Modifications, Post-Modifications Recorded Investment	712	1,016	1,421
Consumer Installment and Revolving Loans [Member]
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	0	0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	0	0
Impaired Financing Receivable, Trouble Debt Structuring, Total	0	0
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	$ 0	$ 0