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Accumulated Other Comprehensive Income - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income [Line Items] |  |  |
Net gain (loss) on sales of securities |  | $ 725 | $ (428)
Net unrealized gains (losses) recorded in comprehensive income |  | (206) |
Unrealized Gains and Losses on Available for Sale Securities |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Reduction of unrealized losses related to securities | $ 529 |  |
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, net of tax | 17 |  |
Tax Benefit (Expense) |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Reduction in tax benefits upon adoption of ASUs | $ 546 |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available for Sale Securities |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Net gain (loss) on sales of securities |  | $ 725 |

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