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Investment Securities (Additional Information) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Maximum
Mar. 31, 2013
Minimum
Mar. 31, 2013
Trust Preferred Securities
Mar. 31, 2013
Trust Preferred Securities
Maximum
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]            
Carrying value of securities pledged as collateral $ 330,238 $ 335,775        
Book value of securities sold under agreements to repurchase 148,023 128,094        
Investment amortized cost 857,489 859,124     6,100  
Fair Value of Investments         $ 336  
Percentage of fair value of investments           1.00%
Spread over LIBOR     1.57% 0.85%