Loans and the Allowance for Loan Losses, Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 24,653	$ 21,540
Without Valuation Allowance	10,249	8,372
With Valuation Allowance	10,262	9,196
Associated Allowance	1,213	444
Average Recorded Investment	20,722	16,888
Interest Income Recognized	178	366
Residential 1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	5,396	4,100
Without Valuation Allowance	1,952	681
With Valuation Allowance	3,166	3,235
Associated Allowance	200	226
Average Recorded Investment	5,186	2,354
Interest Income Recognized	14	136
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	13,770	12,459
Without Valuation Allowance	4,820	3,741
With Valuation Allowance	6,022	5,817
Associated Allowance	910	180
Average Recorded Investment	10,954	10,151
Interest Income Recognized	148	242
Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,639	3,782
Without Valuation Allowance	2,880	3,064
With Valuation Allowance	0	0
Associated Allowance	0	0
Average Recorded Investment	2,898	3,320
Interest Income Recognized	0	(9)
Second Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,358	695
Without Valuation Allowance	269	583
With Valuation Allowance	1,024	47
Associated Allowance	53	5
Average Recorded Investment	1,303	542
Interest Income Recognized	14	12
Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	449	370
Without Valuation Allowance	287	286
With Valuation Allowance	50	0
Associated Allowance	50	0
Average Recorded Investment	336	391
Interest Income Recognized	1	(2)
Total Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	24,612	21,406
Without Valuation Allowance	10,208	8,355
With Valuation Allowance	10,262	9,099
Associated Allowance	1,213	411
Average Recorded Investment	20,677	16,758
Interest Income Recognized	177	379
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	21	117
Without Valuation Allowance	21	0
With Valuation Allowance	0	97
Associated Allowance	0	33
Average Recorded Investment	25	104
Interest Income Recognized	0	(14)
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	20	17
Without Valuation Allowance	20	17
With Valuation Allowance	0	0
Associated Allowance	0	0
Average Recorded Investment	20	26
Interest Income Recognized	$ 1	$ 1