Fair Value - Nonrecurrning Measurements (Details) (Nonrecurring, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Other real estate owned	$ 5,449	$ 5,281
Estimated Fair Value | Impaired Loans Receivable | Construction Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	2,390	1,767
Estimated Fair Value | Impaired Loans Receivable | Owner Occupied
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	7,248	4,772
Estimated Fair Value | Impaired Loans Receivable | Non-owner Occupied
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	385	472
Estimated Fair Value | Impaired Loans Receivable | Commercial Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	394	265
Estimated Fair Value | Impaired Loans Receivable | One to Four Family
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	555
Estimated Fair Value | Impaired Loans Receivable | Home Equity Lines of Credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	173
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Other real estate owned	0	0
Level 1 | Impaired Loans Receivable | Construction Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0	0
Level 1 | Impaired Loans Receivable | Owner Occupied
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0	0
Level 1 | Impaired Loans Receivable | Non-owner Occupied
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0	0
Level 1 | Impaired Loans Receivable | Commercial Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0	0
Level 1 | Impaired Loans Receivable | One to Four Family
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0
Level 1 | Impaired Loans Receivable | Home Equity Lines of Credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Other real estate owned	0	0
Level 2 | Impaired Loans Receivable | Construction Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0	0
Level 2 | Impaired Loans Receivable | Owner Occupied
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0	0
Level 2 | Impaired Loans Receivable | Non-owner Occupied
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0	0
Level 2 | Impaired Loans Receivable | Commercial Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0	0
Level 2 | Impaired Loans Receivable | One to Four Family
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0
Level 2 | Impaired Loans Receivable | Home Equity Lines of Credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Other real estate owned	5,449	5,281
Level 3 | Impaired Loans Receivable | Construction Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	2,390	1,767
Level 3 | Impaired Loans Receivable | Owner Occupied
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	7,248	4,772
Level 3 | Impaired Loans Receivable | Non-owner Occupied
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	385	472
Level 3 | Impaired Loans Receivable | Commercial Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	394	265
Level 3 | Impaired Loans Receivable | One to Four Family
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	555
Level 3 | Impaired Loans Receivable | Home Equity Lines of Credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	$ 173