Goodwill and Other Intangible Assets - Summary of Core Deposit Intangibles (Detail) - Core deposit intangibles [Member] $ in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2015
USD ($)
| |
| Finite-Lived Intangible Assets [Line Items] | |
| Core deposit intangibles, Beginning balance | $ 8,074 |
| Core deposit intangibles, Reductions/Amortization | 0 |
| Core deposit intangibles, Additions | 0 |
| Core deposit intangibles, Ending balance | 8,074 |
| Accumulated amortization, Beginning balance | (1,023) |
| Accumulated amortization, Reductions/Amortization | 0 |
| Accumulated amortization, Additions | (1,157) |
| Accumulated amortization, Ending balance | (2,180) |
| Core deposit intangibles, net, Beginning balance | 7,051 |
| Core deposit intangibles, net, Reductions/Amortization | 0 |
| Core deposit intangibles, net, Additions | (1,157) |
| Core deposit intangibles, net, Ending balance | $ 5,894 |