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Organization and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | 6 Months Ended |
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Jun. 30, 2020 | Dec. 31, 2019
Organization And Basis Of Presentation [Line Items] |  |
Increase to beginning balance of allowance for credit losses | $ 17,400 |
Decrease to beginning balance of allowance for off balance sheet items | (300) |
Retained earnings | 88,859 | $ 100,551
Cumulative Effect Period of Adoption Adjustment | Impact of ASU 2016-13 Adoption |  |
Organization And Basis Of Presentation [Line Items] |  |
Retained earnings | $ 12,200 |

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