Loans and Allowance for Loan Losses - Troubled Debt Restructured Loans (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 Loans	Mar. 31, 2012 Loans	Dec. 31, 2012
Troubled Debt Restructurings
Total amount of troubled debt restructured loans outstanding	$ 22,400,000		$ 23,700,000
Allowance for troubled debt restructed loans	900,000		700,000
Amount of troubled debt restructured loans accruing interest	16,700,000		17,700,000
Number of Loans	2	13
Recorded Investment Prior to Modification	391,000
Recorded Investment After Modification	390,000	2,866,000
Number of troubled debt restructured loans with a payment default during the period	4	6
Recorded investment of troubled debt restructured loans with payment default during period	804,000	1,703,000
Below Market Rate
Troubled Debt Restructurings
Number of troubled debt restructured loans with a payment default during the period		2
Recorded investment of troubled debt restructured loans with payment default during period		1,061,000
Principal Payment Reducation
Troubled Debt Restructurings
Number of Loans		2
Recorded Investment After Modification		181,000
Number of troubled debt restructured loans with a payment default during the period		2
Recorded investment of troubled debt restructured loans with payment default during period		422,000
Extended Payment Terms [Member]
Troubled Debt Restructurings
Number of Loans		11
Recorded Investment After Modification		2,685,000
Number of troubled debt restructured loans with a payment default during the period		2
Recorded investment of troubled debt restructured loans with payment default during period		220,000
Extended Payment Terms [Member] | Commercial Loan
Troubled Debt Restructurings
Number of troubled debt restructured loans with a payment default during the period		1
Recorded investment of troubled debt restructured loans with payment default during period		120,000
Real Estate Loans | Below Market Rate | Construction Loans
Troubled Debt Restructurings
Number of troubled debt restructured loans with a payment default during the period		2
Recorded investment of troubled debt restructured loans with payment default during period		1,061,000
Real Estate Loans | Principal Payment Reducation | Construction Loans
Troubled Debt Restructurings
Number of troubled debt restructured loans with a payment default during the period		1
Recorded investment of troubled debt restructured loans with payment default during period		257,000
Real Estate Loans | Principal Payment Reducation | Owner Occupied Commercial [Member]
Troubled Debt Restructurings
Number of Loans		1
Recorded Investment After Modification		172,000
Real Estate Loans | Principal Payment Reducation | Home Equity Lines of Credit
Troubled Debt Restructurings
Number of troubled debt restructured loans with a payment default during the period		1
Recorded investment of troubled debt restructured loans with payment default during period		165,000
Real Estate Loans | Extended Payment Terms [Member] | Construction Loans
Troubled Debt Restructurings
Number of troubled debt restructured loans with a payment default during the period	1
Recorded investment of troubled debt restructured loans with payment default during period	500,000
Real Estate Loans | Extended Payment Terms [Member] | Non-owner Occupied
Troubled Debt Restructurings
Number of Loans	1
Recorded Investment Prior to Modification	224,000
Recorded Investment After Modification	166,000
Number of troubled debt restructured loans with a payment default during the period	2
Recorded investment of troubled debt restructured loans with payment default during period	211,000
Real Estate Loans | Extended Payment Terms [Member] | Owner Occupied Commercial [Member]
Troubled Debt Restructurings
Number of Loans	1	2
Recorded Investment Prior to Modification	167,000
Recorded Investment After Modification	224,000	664,000
Number of troubled debt restructured loans with a payment default during the period	1
Recorded investment of troubled debt restructured loans with payment default during period	93,000
Real Estate Loans | Extended Payment Terms [Member] | One to Four Family
Troubled Debt Restructurings
Number of Loans		3
Recorded Investment After Modification		751,000
Number of troubled debt restructured loans with a payment default during the period		1
Recorded investment of troubled debt restructured loans with payment default during period		100,000
Commercial Loan | Extended Payment Terms [Member]
Troubled Debt Restructurings
Number of Loans		5
Recorded Investment After Modification		1,246,000
Consumer Loan [Member] | Principal Payment Reducation
Troubled Debt Restructurings
Number of Loans		1
Recorded Investment After Modification		9,000
Consumer Loan [Member] | Extended Payment Terms [Member]
Troubled Debt Restructurings
Number of Loans		1
Recorded Investment After Modification		$ 24,000