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Premises and Equipment - Schedule of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Land $ 14,489 $ 13,119
Bank premises 65,215 62,154
Furniture and equipment 25,610 28,759
Premises and equipment, gross 105,314 104,032
Accumulated depreciation and amortization (59,148) (61,946)
Premises and equipment, net $ 46,166 $ 42,086