Nature of operations and basis of presentation (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
Organization, Consolidation and Presentation of Financial Statements | |||
Reversal of accelerated FDIC Indemnification Asset, Accretion of Discount | $ 0 | $ 12,492 | $ 0 |