Loans and Allowance for Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	$ 5,952	$ 9,895	$ 6,274
Impaired loans without a valuation allowance, Unpaid Principal Balance	6,073	10,060	6,399
Impaired loans without a valuation allowance, Average Recorded Investment	7,914	9,541	8,562
Impaired loans without a valuation allowance, Interest Income Recognized	326	519	306
Impaired loans with a valuation allowance, Recorded Investment	2,886	3,895	8,915
Impaired loans with a valuation allowance, Unpaid Principal Balance	3,021	3,996	8,956
Impaired loans with a valuation allowance, Related Allowance	696	564	4,046
Impaired loans with a valuation allowance, Average Recorded Investment	1,760	6,996	10,564
Impaired loans with a valuation allowance, Interest Income Recognized	174	261	457
Total impaired loans, Recorded Investment	8,838	13,790	15,189
Total impaired loans, Unpaid Principal Balance	9,094	14,056	15,355
Total impaired loans, Related Allowance	696	564	4,046
Total impaired loans, Average Recorded Investment	9,674	16,537	19,126
Total impaired loans, Interest Income Recognized	500	780	763
Commercial Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	2,428	5,786	3,406
Impaired loans without a valuation allowance, Unpaid Principal Balance	2,480	5,854	3,453
Impaired loans without a valuation allowance, Average Recorded Investment	4,386	4,657	4,389
Impaired loans without a valuation allowance, Interest Income Recognized	127	340	180
Impaired loans with a valuation allowance, Recorded Investment	2,029	2,196	5,807
Impaired loans with a valuation allowance, Unpaid Principal Balance	2,029	2,285	5,848
Impaired loans with a valuation allowance, Related Allowance	404	498	2,230
Impaired loans with a valuation allowance, Average Recorded Investment	683	4,869	6,616
Impaired loans with a valuation allowance, Interest Income Recognized	98	118	215
Consumer Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	1,738	2,177	513
Impaired loans without a valuation allowance, Unpaid Principal Balance	1,742	2,202	540
Impaired loans without a valuation allowance, Average Recorded Investment	1,880	2,669	1,538
Impaired loans without a valuation allowance, Interest Income Recognized	114	96	52
Impaired loans with a valuation allowance, Recorded Investment	341	1,270	1,353
Impaired loans with a valuation allowance, Unpaid Principal Balance	476	1,281	1,353
Impaired loans with a valuation allowance, Related Allowance	15	11	576
Impaired loans with a valuation allowance, Average Recorded Investment	676	1,353	2,606
Impaired loans with a valuation allowance, Interest Income Recognized	24	90	61
Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	753	369	244
Impaired loans without a valuation allowance, Unpaid Principal Balance	766	383	251
Impaired loans without a valuation allowance, Average Recorded Investment	462	358	358
Impaired loans without a valuation allowance, Interest Income Recognized	44	23	19
Impaired loans with a valuation allowance, Recorded Investment	0	0	706
Impaired loans with a valuation allowance, Unpaid Principal Balance	0	0	706
Impaired loans with a valuation allowance, Related Allowance	0	0	460
Impaired loans with a valuation allowance, Average Recorded Investment	0	177	642
Impaired loans with a valuation allowance, Interest Income Recognized	0	0	49
Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	1,033	1,563	2,111
Impaired loans without a valuation allowance, Unpaid Principal Balance	1,085	1,621	2,155
Impaired loans without a valuation allowance, Average Recorded Investment	1,186	1,857	2,277
Impaired loans without a valuation allowance, Interest Income Recognized	41	60	55
Impaired loans with a valuation allowance, Recorded Investment	516	429	1,049
Impaired loans with a valuation allowance, Unpaid Principal Balance	516	430	1,049
Impaired loans with a valuation allowance, Related Allowance	277	55	780
Impaired loans with a valuation allowance, Average Recorded Investment	401	597	700
Impaired loans with a valuation allowance, Interest Income Recognized	52	53	132
Consumer and Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	0	0	0
Impaired loans without a valuation allowance, Unpaid Principal Balance	0	0	0
Impaired loans without a valuation allowance, Average Recorded Investment	0	0	0
Impaired loans without a valuation allowance, Interest Income Recognized	0	0	0
Impaired loans with a valuation allowance, Recorded Investment	0	0	0
Impaired loans with a valuation allowance, Unpaid Principal Balance	0	0	0
Impaired loans with a valuation allowance, Related Allowance	0	0	0
Impaired loans with a valuation allowance, Average Recorded Investment	0	0	0
Impaired loans with a valuation allowance, Interest Income Recognized	$ 0	$ 0	$ 0