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Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property Plant and Equipment Useful Life and Values [Abstract]    
Land $ 33,023 $ 35,473
Premises 143,757 150,868
Equipment 130,066 117,223
Property Plant and Equipment Gross 306,846 303,564
Accumulated depreciation (147,766) (134,808)
Property Plant and Equipment Net $ 159,080 $ 168,756