Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) Member	Dec. 31, 2015 USD ($)
Commitments And Contingencies [Line Items]
Rent expense | $	$ 568,000	$ 160,000
Salary continuation term of employment arrangement	1 year
Senior Management [Member]
Commitments And Contingencies [Line Items]
Number of members with change in control agreements | Member	7
Change in control agreement description of terms	The company provide that if, within two years of a change of control of the Company or the Bank, the executive in involuntarily terminated other than for cause, disability or death, or voluntarily resigns for good reason, the executive will be entitled to a lump-sum payment equal to two times salary plus bonus, except for one executive where the payment is equal to one times salary plus bonus.
Minimum [Member]
Commitments And Contingencies [Line Items]
Lease options to extend the period	2 years
Maximum [Member]
Commitments And Contingencies [Line Items]
Lease options to extend the period	3 years