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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 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 $ 438,010   $ 438,010     $ 449,408
Book value of securities sold under agreements to repurchase 133,101   133,101     $ 120,027
Net realized gains (losses) on sales of available for sale securities $ (93) $ 844 932 $ 1,425    
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 (losses) on sales of available for sale securities     $ 45