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Fair Values of Financial Instruments Reconciliation of Beginning and Ending Balances of Level 3 Assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
 
Three Months Ended
March 31,
 
2013
 
2012
 
(Dollars in thousands)
Available for sale securities
 
 
 
Beginning balance
$
1,812

 
$
2,098

Principal returned
(368
)
 
(41
)
Accretion of discount
129

 
26

Total gains (losses) (realized/unrealized):
 
 
 
Included in other comprehensive income (loss)
151

 
102

Included in operations

 
(158
)
Ending balance
$
1,724

 
$
2,027

   
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net $ 3,237 $ 2,881  
Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1,812 2,098 1,724
Principal Returned on Level 3 Assets (368) (41)  
Amortization/Accretion of Premium/Discount on Level 3 Assets 129 26  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 151 102  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 (158)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   $ 2,027 $ 1,724