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Time Deposits - Summary of Large time Deposits and time Deposits Meet or Exceed Current FDIC Insurance Limit for Periods Presented (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deposits [Abstract]    
Time deposits of $100,000 or more $ 349,918 $ 319,811
Time deposits of $250,000 or more $ 132,957 $ 122,391