Reserve for Unfunded Commitments - Summary of Activity in Reserve for Unfunded Commitments (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
Commitments and Contingencies Disclosure [Abstract] | ||||
Balance at beginning of period | $ 3,864 | $ 2,734 | $ 3,164 | $ 2,719 |
Provision (reversal of provision) for losses - unfunded commitments | (137) | (135) | 563 | (120) |
Balance at end of period | $ 3,727 | $ 2,599 | $ 3,727 | $ 2,599 |