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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months: Fair Value $ 14,226,000 $ 18,714,000
12 Months or more: Fair Value 19,584,000 7,909,000
Total: Fair Value 33,810,000 26,623,000
Less than 12 Months: Unrealized Losses 369,000 1,281,000
12 Months or more: Unrealized Losses 3,115,000 3,288,000
Total: Unrealized Losses 3,484,000 4,569,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Severity

The unrealized losses on the remaining securities are due to changes in market value resulting from changes in market interest rates and are considered temporary.

 
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Geographic Concentration

At September 30, 2012, the investment portfolio included twenty-five municipal securities with a total market value of $12.0 million. These securities are reviewed quarterly for impairment. Research on each issuer is completed to ensure the financial stability of the municipal entity. The largest geographic concentration was in California where thirteen municipal securities had a market value of $6.1 million. As of September 30, 2012, management found no evidence of OTTI on any of the municipal securities held in the investment securities portfolio.

 
Total fair value of the investment portfolio 33,810,000 26,623,000
Number of municipal securities in investment portfolio 25  
Total market value of municipal securities 192,529,000 174,323,000
Number of securities in the geographical area with the highest concentration of municipal securities 13  
Market value of municipal securities in the geographical area with the highest concentration of municipal securities 6,100,000  
Number of municipal securities with OTTI impairment 0  
Collateralized Mortgage Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total market value of municipal securities 103,475,000 120,011,000
Mortgage-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or more: Fair Value   9,000
Total: Fair Value   9,000
Total fair value of the investment portfolio   9,000
Total market value of municipal securities 21,538,000 14,116,000
Municipal securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or more: Fair Value 1,717,000 4,490,000
Total: Fair Value 1,717,000 4,490,000
12 Months or more: Unrealized Losses 36,000 323,000
Total: Unrealized Losses 36,000 323,000
Total fair value of the investment portfolio 1,717,000 4,490,000
Total market value of municipal securities 11,960,000 11,034,000
Corporate bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months: Fair Value 4,821,000 18,714,000
12 Months or more: Fair Value 14,751,000  
Total: Fair Value 19,572,000 18,714,000
Less than 12 Months: Unrealized Losses 178,000 1,281,000
12 Months or more: Unrealized Losses 245,000  
Total: Unrealized Losses 423,000 1,281,000
Total fair value of the investment portfolio 19,572,000 18,714,000
Total market value of municipal securities 32,377,000 25,617,000
Asset-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months: Fair Value 9,405,000  
Total: Fair Value 9,405,000  
Less than 12 Months: Unrealized Losses 191,000  
Total: Unrealized Losses 191,000  
Total fair value of the investment portfolio 9,405,000  
Total market value of municipal securities 19,930,000  
Trust Preferred Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or more: Fair Value 3,116,000 3,410,000
Total: Fair Value 3,116,000 3,410,000
12 Months or more: Unrealized Losses 2,834,000 2,965,000
Total: Unrealized Losses 2,834,000 2,965,000
Total fair value of the investment portfolio 3,116,000 3,410,000
Total market value of municipal securities 3,116,000 3,410,000
Other securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total market value of municipal securities $ 133,000 $ 135,000