Fair Value of Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	$ 247,890
Obligations of U.S. government agencies
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	4,836
Mortgage-backed securities - Agency
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	155,793
Mortgage-backed securities - Non-agency
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	23,926
Obligations of state and municipal securities
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	31,004
Asset backed securities
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	32,331
Significant Other Observable Inputs (Level 2)
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	247,890	287,682
Recurring basis | Significant Other Observable Inputs (Level 2)
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	247,890	287,682
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. government agencies
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	4,836	7,567
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities - Agency
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	155,793	145,768
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities - Non-agency
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	23,926	44,795
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of state and municipal securities
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	31,004	68,968
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset backed securities
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	32,331	20,584
Recurring basis | Assets At Fair Value
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	247,890	287,682
Recurring basis | Assets At Fair Value | Obligations of U.S. government agencies
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	4,836	7,567
Recurring basis | Assets At Fair Value | Mortgage-backed securities - Agency
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	155,793	145,768
Recurring basis | Assets At Fair Value | Mortgage-backed securities - Non-agency
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	23,926	44,795
Recurring basis | Assets At Fair Value | Obligations of state and municipal securities
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	31,004	68,968
Recurring basis | Assets At Fair Value | Asset backed securities
Financial instruments of the Company measured at fair value on a recurring basis
Total assets measured on recurring basis	$ 32,331	$ 20,584