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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2009
Dec. 31, 2014
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]            
Carrying value of securities pledged as collateral $ 646,124   $ 646,124     $ 449,408
Book value of securities sold under agreements to repurchase 149,014   149,014     $ 120,027
Net realized gains on sales of available for sale securities $ 1,115 $ 910 2,047 $ 2,335    
Corporate obligations            
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]            
Net impairment losses recognized in earnings         $ 500  
Net realized gains on sales of available for sale securities     $ 45