Reserve for Unfunded Commitments - Summary of Activity in Reserve for Unfunded Commitments (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Commitments and Contingencies Disclosure [Abstract] | |||
| Balance at beginning of period | $ 2,145 | $ 2,415 | $ 3,615 |
| Acquisitions | 125 | ||
| Provision for losses - Unfunded commitments | 330 | (395) | (1,200) |
| Balance at end of period | $ 2,475 | $ 2,145 | $ 2,415 |