Business Combination - Additional Information (Detail) - Colonial American Bank [Member]	Jul. 31, 2015 USD ($)
Business Acquisition [Line Items]
Purchase accounting adjustments, assets	$ 142,400,000
Purchase accounting adjustments, loans	121,466,000
Purchase accounting adjustments, deposits	123,346,000
Total consideration paid	11,900,000
Cash consideration paid for outstanding warrants and fractional shares	$ 127,000