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Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Held-to-maturity Securities [Line Items]          
Carrying value $ 5,199   $ 5,199   $ 0
Cost or amortized cost 5,199   5,199   0
Fair value 5,200   5,200   0
Schedule of Trading Securities and Other Trading Assets [Line Items]          
Carrying Value 0   0   212
Cost or amortized cost 0 224 0 224 224
Fair Value 0 194 0 194 212
Gross unrealized gains (losses) on investment securities held to maturity [Abstract]          
Gross unrealized gains (losses) 1   1   0
Unrealized gains (losses) on investment securities [Abstract]          
Cost basis 0 224 0 224 224
Current value 0 194 0 194 212
Unrealized gains (losses) 0 (30) 0 (30)  
Realized gains (losses) on investment securities [Abstract]          
Net sale proceeds 89 3 594 555  
Cost basis (83) 0 (563) (537)  
Realized gains (losses) 6 3 31 18  
Equity Securities [Member]
         
Schedule of Trading Securities and Other Trading Assets [Line Items]          
Carrying Value 0   0   212
Cost or amortized cost 0   0   224
Fair Value 0   0   212
Unrealized gains (losses) on investment securities [Abstract]          
Cost basis 0   0   224
Current value 0   0   212
US Treasury Bills [Member]
         
Held-to-maturity Securities [Line Items]          
Carrying value 5,199   5,199   0
Cost or amortized cost 5,199   5,199   0
Fair value $ 5,200   $ 5,200   $ 0