Indemnification Asset/Liability - Summary of Activity in Balance of Indemnification Asset (Liability) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
FDIC Indemnification Asset [Roll Forward]      
Beginning balance $ (349) $ 206 $ 1,997
Effect of actual covered losses (recoveries) and increase (decrease) in estimated future covered losses (93) (853) (1,419)
Change in estimated "true up" liability (71) (100)  
Reimbursable (revenue) expenses, net 4 85 (159)
Payments made (received) (12) 313 (213)
Ending balance (521) (349) 206
Amount of indemnification asset (liability) recorded in other assets 77 (349) 206
Amount of indemnification liability recorded in other liabilities (598)    
Ending balance $ (349) $ 206 $ 1,997