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Loans and Allowance for Loan Losses - Related Party Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]      
Balance Beginning of the Period $ 24,001 $ 27,486 $ 37,577
Additions 7,986 7,350 16,133
Collections/ Terminations (12,096) (10,835) (26,224)
Balance End of the Period $ 19,891 $ 24,001 $ 27,486