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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2009
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]            
Carrying value of securities pledged as collateral $ 607,799   $ 607,799     $ 637,358
Book value of securities sold under agreements to repurchase 135,855   135,855     $ 153,789
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]            
Net realized gains on sales of available for sale securities $ 706 $ (93) $ 1,703 $ 932    
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