Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Property, Plant and Equipment, Net, by Type [Abstract] | ||
| Land & land improvements | $ 8,909 | $ 8,933 |
| Buildings | 38,643 | 39,638 |
| Furniture and equipment | 31,081 | 28,446 |
| Premises and equipment, gross | 78,633 | 77,017 |
| Less: Accumulated depreciation | (35,518) | (33,570) |
| Premises and equipment less depreciation, gross | 43,115 | 43,447 |
| Construction in progress | 696 | 46 |
| Total premises and equipment | $ 43,811 | $ 43,493 |