Accrued Interest Receivable and Other Assets - Details of Accrued Interest Receivable and Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Interest Receivable and Other Assets [Abstract]
Other real estate owned	$ 4,969	$ 1,276
Accrued interest receivable	10,794	7,463
Accrued income and other receivables	7,751	2,725
Fair market value of derivative financial instruments	1,058	1,089
Other prepaid expenses	17,686	10,880
Net federal deferred tax assets	9,965	10,521
Other Assets	20	0
Total accrued interest and other assets	$ 52,243	$ 33,954