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Premises and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accumulated depreciations and amortization $ (80,728) $ (74,652)
Total 70,016 60,331
Land    
Premise and equipment, gross 9,311 9,364
Premises    
Premise and equipment, gross 75,633 68,876
Furniture, fixtures, and equipment    
Premise and equipment, gross $ 65,800 $ 56,743