Loans and Allowance for Loan Losses - Troubled Debt Restructured Loans (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012 Loans	Jun. 30, 2012 Loans	Dec. 31, 2011
Troubled Debt Restructurings
Total amount of troubled debt restructured loans outstanding	$ 36,200,000	$ 36,200,000	$ 43,500,000
Allowance for troubled debt restructed loans	1,000,000	1,000,000	2,300,000
Amount of troubled debt restructured loans accruing interest	12,600,000	12,600,000	17,200,000
Number of Loans	9	22
Recorded Investment Prior to Modification	2,602,000	6,095,000
Recorded Investment After Modification	2,224,000	5,020,000
Adjustment to Reserves as a Result of the Restructuring	43,000	(32,000)
Number of troubled debt restructured loans with a payment default during the period	2	5
Recorded investment of troubled debt restructured loans with payment default during period	997,000	2,315,000
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
Extended Payment Terms
Troubled Debt Restructurings
Number of Loans	8	19
Recorded Investment Prior to Modification	2,203,000	5,359,000
Recorded Investment After Modification	1,825,000	4,443,000
Adjustment to Reserves as a Result of the Restructuring	(60,000)	(136,000)
Number of troubled debt restructured loans with a payment default during the period	1	1
Recorded investment of troubled debt restructured loans with payment default during period	24,000	24,000
Principal Payment Reducation
Troubled Debt Restructurings
Number of Loans	1	3
Recorded Investment Prior to Modification	399,000	736,000
Recorded Investment After Modification	399,000	577,000
Adjustment to Reserves as a Result of the Restructuring	103,000	104,000
Number of troubled debt restructured loans with a payment default during the period	1	2
Recorded investment of troubled debt restructured loans with payment default during period	973,000	1,230,000
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 | Extended Payment Terms | Construction Loans
Troubled Debt Restructurings
Number of Loans	3	3
Recorded Investment Prior to Modification	710,000	710,000
Recorded Investment After Modification	352,000	352,000
Adjustment to Reserves as a Result of the Restructuring	(25,000)	(25,000)
Real Estate Loans | Extended Payment Terms | Owner Occupied
Troubled Debt Restructurings
Number of Loans	3	5
Recorded Investment Prior to Modification	1,046,000	1,712,000
Recorded Investment After Modification	1,026,000	1,669,000
Adjustment to Reserves as a Result of the Restructuring	(55,000)	(66,000)
Real Estate Loans | Extended Payment Terms | Non-owner Occupied
Troubled Debt Restructurings
Number of Loans	1	1
Recorded Investment Prior to Modification	211,000	211,000
Recorded Investment After Modification	211,000	211,000
Adjustment to Reserves as a Result of the Restructuring	28,000	28,000
Real Estate Loans | Extended Payment Terms | One to Four Family
Troubled Debt Restructurings
Number of Loans		3
Recorded Investment Prior to Modification		827,000
Recorded Investment After Modification		742,000
Adjustment to Reserves as a Result of the Restructuring		12,000
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	2
Recorded investment of troubled debt restructured loans with payment default during period	973,000	1,230,000
Real Estate Loans | Principal Payment Reducation | Owner Occupied
Troubled Debt Restructurings
Number of Loans	1	2
Recorded Investment Prior to Modification	399,000	571,000
Recorded Investment After Modification	399,000	568,000
Adjustment to Reserves as a Result of the Restructuring	103,000	95,000
Commercial | Extended Payment Terms
Troubled Debt Restructurings
Number of Loans	1	6
Recorded Investment Prior to Modification	236,000	1,872,000
Recorded Investment After Modification	236,000	1,469,000
Adjustment to Reserves as a Result of the Restructuring	(8,000)	(85,000)
Consumer and other | Extended Payment Terms
Troubled Debt Restructurings
Number of Loans		1
Recorded Investment Prior to Modification		27,000
Recorded Investment After Modification		0
Adjustment to Reserves as a Result of the Restructuring		0
Number of troubled debt restructured loans with a payment default during the period	1	1
Recorded investment of troubled debt restructured loans with payment default during period	24,000	24,000
Consumer and other | Principal Payment Reducation
Troubled Debt Restructurings
Number of Loans		1
Recorded Investment Prior to Modification		165,000
Recorded Investment After Modification		9,000
Adjustment to Reserves as a Result of the Restructuring		$ 9,000