Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Summary of Other Intangible Assets (Detail)

v3.8.0.1
Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization $ (1,183) $ (838)
Goodwill 11,031 11,031
Gross carrying amount 13,727 13,727
Net carrying amount $ 12,544 12,889
Core deposit intangible [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization period 10 years  
Gross carrying amount, excluding goodwill $ 2,213 2,213
Accumulated amortization (1,119) (838)
Net carrying amount, excluding goodwill $ 1,094 1,375
Third Party Originators Intangible [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization period 7 years  
Gross carrying amount, excluding goodwill $ 483 483
Accumulated amortization (64) 0
Net carrying amount, excluding goodwill $ 419 $ 483