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Fair Value Measurement and Fair Value of Financial Instruments (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment Securities Available-for-Sale: Fair Value $ 496,815,000 $ 414,507,000
Tranche Super Senior  
Debt Securities Realized Loss 318,000  
Other Than Temporary Impairment Losses Debt Securities 484,000  
Debt Security Percent Of Par 15.3  
Debt Security Par Value 3,200,000  
Available-for-sale Debt Securities, Amortized Cost Basis 2,100,000  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 5,435,000 11,825,000
Impaired Financing Receivable, Related Allowance 645,000 1,085,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,500,000 2,121,000
Parent Company [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment Securities Available-for-Sale: Fair Value 543,000 419,000
Collateralized mortgage obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment Securities Available-for-Sale: Fair Value 2,120,000 1,899,000
Tranche Super Senior  
Debt Securities Realized Loss 318,000,000  
Other Than Temporary Impairment Losses Debt Securities 484,000  
Debt Security Percent Of Par 15,300,000  
Debt Security Par Value 3,200,000  
Available-for-sale Debt Securities, Amortized Cost Basis $ 2,100,000  
Sale Of Debt Security Transaction Date Jan. 01, 2013  
Collateralized mortgage obligations [Member] | Nevada [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Geographic Concentration 6.30%  
Collateralized mortgage obligations [Member] | Florida [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Geographic Concentration 6.50%  
Collateralized mortgage obligations [Member] | Virginia [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Geographic Concentration 6.10%  
Collateralized mortgage obligations [Member] | Arizona [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Geographic Concentration 10.50%  
Collateralized mortgage obligations [Member] | California [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Geographic Concentration 18.20%  
Collateralized mortgage obligations [Member] | Standard & Poor's, AAA Rating [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities Number Owned 1  
Collateralized mortgage obligations [Member] | Standard & Poor's, AA Rating [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities Number Owned 1