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Goodwill and Other Intangible Assets (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Summary of finite-lived intangible assets    
Gross Carrying Amount $ 49,962 $ 47,952
Accumulated Amortization (25,888) (19,141)
Net Carrying Amount 24,074 28,811
Core deposit intangible    
Summary of finite-lived intangible assets    
Gross Carrying Amount 47,992 45,982
Accumulated Amortization (25,188) (18,572)
Net Carrying Amount 22,804 27,410
Customer relationship intangible    
Summary of finite-lived intangible assets    
Gross Carrying Amount 1,970 1,970
Accumulated Amortization (700) (569)
Net Carrying Amount $ 1,270 $ 1,401