Fair Value Measurement for Financial and Non-Financial Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	$ 342,438	$ 352,437
Servicing assets	17,536	16,108
Securities of government sponsored enterprises
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	59,950	60,789
Mortgage-backed securities (residential)
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	89,325	90,869
Collateralized mortgage obligations (residential)
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	127,814	135,653
Corporate securities
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	39,242	39,530
Municipal bonds
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	26,107	25,596
Recurring basis | Total Fair Value
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Servicing assets	17,536	16,108
Recurring basis | Total Fair Value | Securities of government sponsored enterprises
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	59,950	60,789
Recurring basis | Total Fair Value | Mortgage-backed securities (residential)
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	89,325	90,869
Recurring basis | Total Fair Value | Collateralized mortgage obligations (residential)
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	127,814	135,653
Recurring basis | Total Fair Value | Corporate securities
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	39,242	39,530
Recurring basis | Total Fair Value | Municipal bonds
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	26,107	25,596
Recurring basis | Significant Other Observable Inputs (Level 2) | Securities of government sponsored enterprises
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	59,950	60,789
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities (residential)
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	89,325	90,869
Recurring basis | Significant Other Observable Inputs (Level 2) | Collateralized mortgage obligations (residential)
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	127,814	135,653
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	39,242	39,530
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Investments	26,107	25,596
Recurring basis | Significant Unobservable Inputs (Level 3)
Summary of valuation of the company's financial instruments measured on a recurring basis by the fair value hierarchy levels
Servicing assets	$ 17,536	$ 16,108