Fair Value (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Financial assets and liabilities measured on a recurring and non-recurring basis
Foreclosed assets:	$ 738,000	$ 1,270,000
Recurring basis
Financial assets and liabilities measured on a recurring and non-recurring basis
Transfers between Level 1 and Level 2	0	0
Recurring basis | Balance
Financial assets and liabilities measured on a recurring and non-recurring basis
I/O strip receivables	1,777,000	1,786,000
Recurring basis | Balance | Agency mortgage-backed securities
Financial assets and liabilities measured on a recurring and non-recurring basis
Available-for-sale securities	271,077,000	291,244,000
Recurring basis | Balance | Corporate bonds
Financial assets and liabilities measured on a recurring and non-recurring basis
Available-for-sale securities	54,892,000	55,588,000
Recurring basis | Balance | Trust preferred securities
Financial assets and liabilities measured on a recurring and non-recurring basis
Available-for-sale securities	20,831,000	21,080,000
Recurring basis | Significant Other Observable Inputs (Level 2)
Financial assets and liabilities measured on a recurring and non-recurring basis
I/O strip receivables	1,777,000	1,786,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Agency mortgage-backed securities
Financial assets and liabilities measured on a recurring and non-recurring basis
Available-for-sale securities	271,077,000	291,244,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds
Financial assets and liabilities measured on a recurring and non-recurring basis
Available-for-sale securities	54,892,000	55,588,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Trust preferred securities
Financial assets and liabilities measured on a recurring and non-recurring basis
Available-for-sale securities	20,831,000	21,080,000
Non-recurring basis | Balance
Financial assets and liabilities measured on a recurring and non-recurring basis
Impaired loans - held-for-investment:	8,006,000	9,172,000
Foreclosed assets:	738,000	1,270,000
Non-recurring basis | Balance | Land and construction
Financial assets and liabilities measured on a recurring and non-recurring basis
Foreclosed assets:	657,000	1,187,000
Non-recurring basis | Balance | Commercial
Financial assets and liabilities measured on a recurring and non-recurring basis
Impaired loans - held-for-investment:	2,982,000	3,645,000
Foreclosed assets:	81,000	83,000
Non-recurring basis | Balance | Real estate | Commercial and residential
Financial assets and liabilities measured on a recurring and non-recurring basis
Impaired loans - held-for-investment:	3,217,000	3,674,000
Non-recurring basis | Balance | Real estate | Land and construction
Financial assets and liabilities measured on a recurring and non-recurring basis
Impaired loans - held-for-investment:	1,685,000	1,723,000
Non-recurring basis | Balance | Consumer
Financial assets and liabilities measured on a recurring and non-recurring basis
Impaired loans - held-for-investment:	122,000	130,000
Non-recurring basis | Significant Unobservable Inputs (Level 3)
Financial assets and liabilities measured on a recurring and non-recurring basis
Impaired loans - held-for-investment:	8,006,000	9,172,000
Foreclosed assets:	738,000	1,270,000
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Land and construction
Financial assets and liabilities measured on a recurring and non-recurring basis
Foreclosed assets:	657,000	1,187,000
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Commercial
Financial assets and liabilities measured on a recurring and non-recurring basis
Impaired loans - held-for-investment:	2,982,000	3,645,000
Foreclosed assets:	81,000	83,000
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Real estate | Commercial and residential
Financial assets and liabilities measured on a recurring and non-recurring basis
Impaired loans - held-for-investment:	3,217,000	3,674,000
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Real estate | Land and construction
Financial assets and liabilities measured on a recurring and non-recurring basis
Impaired loans - held-for-investment:	1,685,000	1,723,000
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Consumer
Financial assets and liabilities measured on a recurring and non-recurring basis
Impaired loans - held-for-investment:	$ 122,000	$ 130,000