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Goodwill and Intangible Assets (Details Textuals) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill acquired during period $ 3,000    
Additions to finite-lived intangible assets $ 1,000   $ 12,000
Goodwill   $ 971,951 968,844
Fully amortized core deposits intangibles   15,000  
Goodwill, Impairment Loss   $ 0 $ 0