Loans and Allowance for Loan Losses - Related Party Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Balance Beginning of the Period	$ 37,577	$ 25,019	$ 27,134
Additions	16,133	22,330	22,521
Collections/ Terminations	(26,224)	(9,772)	(24,636)
Balance End of the Period	$ 27,486	$ 37,577	$ 25,019