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Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Held-to-maturity Securities [Line Items]      
Carrying value $ 78,970   $ 79,787
Cost or amortized cost 78,970   79,787
Fair value 78,973   79,794
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Carrying Value 0   0
Cost or amortized cost 0   0
Fair Value 0   0
Gross unrealized gains (losses) on investment securities held to maturity [Abstract]      
Gross unrealized gains (losses) 3   7
Unrealized gains (losses) on investment securities [Abstract]      
Cost basis 0   0
Current value 0   0
Unrealized gains (losses) 0   0
Realized gains (losses) on investment securities [Abstract]      
Net sale proceeds 3 233  
Cost basis (1) (217)  
Realized gains (losses) 2 16  
Equity Securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Carrying Value 0   0
Cost or amortized cost 0   0
Fair Value 0   0
Unrealized gains (losses) on investment securities [Abstract]      
Cost basis 0   0
Current value 0   0
US Treasury Bills [Member]
     
Held-to-maturity Securities [Line Items]      
Carrying value 78,970   79,787
Cost or amortized cost 78,970   79,787
Fair value $ 78,973   $ 79,794