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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2009
Dec. 31, 2015
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]        
Carrying value of securities pledged as collateral $ 625,319     $ 637,358
Book value of securities sold under agreements to repurchase 145,639     $ 153,789
Net realized gains on sales of available for sale securities $ 997 $ 1,025    
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