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Investment Securities - Narrative (Details) (USD $)
9 Months Ended
Sep. 30, 2013
position
Dec. 31, 2012
position
Sep. 30, 2013
A Minus Rating [Member]
position
Dec. 31, 2012
A Minus Rating [Member]
position
Sep. 30, 2013
External Credit Rating, BBB Plus Rating [Member]
position
Sep. 30, 2013
External Credit Rating, B Plus Rating [Member]
position
Sep. 30, 2013
Investment Securities [Member]
Sep. 30, 2012
Investment Securities [Member]
Sep. 30, 2013
Investment Securities [Member]
position
Dec. 31, 2012
Investment Securities [Member]
position
Sep. 30, 2013
Fixed Interest Rate [Member]
Corporate Debt Securities [Member]
Dec. 31, 2012
Fixed Interest Rate [Member]
Corporate Debt Securities [Member]
Sep. 30, 2013
Fixed Interest Rate [Member]
Corporate Debt Securities [Member]
External Credit Rating, BBB Plus Rating [Member]
Dec. 31, 2012
Fixed Interest Rate [Member]
Asset-backed Securities [Member]
Sep. 30, 2013
Floating Interest Rate [Member]
Corporate Debt Securities [Member]
Dec. 31, 2012
Floating Interest Rate [Member]
Corporate Debt Securities [Member]
Sep. 30, 2013
Floating Interest Rate [Member]
Asset-backed Securities [Member]
Dec. 31, 2012
Floating Interest Rate [Member]
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]                                    
Number of securities in Loss Position 46 17 2 1 1 1                        
Available-for-sale Securities, Unrealized Losses                 $ 17,291,000 $ 23,767,000 $ 40,000 $ 0 $ 23,000 $ 0 $ 42,000 $ 0 $ 48,000 $ 36,000
Proceeds from sale of available-for-sale investment securities             170,614,000 5,028,000                    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of securities in unrealized loss position greater than twelve months                 7 9                
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 15,627,000 23,521,000                 0       0   0 9,000
Available-for-sale Securities, Gross Realized Gains             3,100,000 28,000                    
Available-for-sale securities in a loss position for more than 12 months, qualitative disclosure, percent of amortized cost                 89.20%                  
Trading Securities Amortized Cost                                 3,671,000 4,327,000
Trading Securities                                 $ 977,000 $ 1,247,000
Trading securities weighted-average yield                                 4.27% 4.29%