Allowance for Loan Losses Schedule of Loans Modified in a TDR (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Count	25	25
Balance prior to TDR	$ 6,949	$ 5,644
Balance after TDR	6,927	5,812
One-to-four family residential
Financing Receivable, Modifications [Line Items]
Count	17	15
Balance prior to TDR	1,310	1,513
Balance after TDR	1,363	1,706
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Count	0	5
Balance prior to TDR	0	1,160
Balance after TDR	0	1,160
Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Count	6	4
Balance prior to TDR	5,323	2,864
Balance after TDR	5,230	2,832
Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Count	1	1
Balance prior to TDR	66	107
Balance after TDR	84	114
Commercial construction and land development
Financing Receivable, Modifications [Line Items]
Count	1	0
Balance prior to TDR	250	0
Balance after TDR	250	0
Total commercial loans
Financing Receivable, Modifications [Line Items]
Count	8	10
Balance prior to TDR	5,639	4,131
Balance after TDR	$ 5,564	$ 4,106