Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Additional Information (Detail)

v3.3.1.900
Intangible Assets - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Intangible assets acquired $ 2,213,000 $ 2,213,000
Total amortization expense for other intangible assets, including discontinued operations 379,000  
Intangible asset impairment charges 0 0
Core deposit intangible [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets acquired $ 2,213,000 $ 2,213,000