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Accumulated Other Comprehensive Income - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net gain (loss) on sales of securities |  | $ 19 | $ 267 | $ (341) | $ 1,473
Net unrealized gains (losses) recorded in comprehensive income |  | 21 | 227 | 116 | 971
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reduction of unrealized losses related to securities | $ 529 |  |  | 529 |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
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 |  |  | 17 |
Tax Expense Benefit [Member] |  |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reduction in tax benefits upon adoption of ASUs | $ 546 |  |  | 546 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net gain (loss) on sales of securities |  | $ 19 | $ 267 | $ 87 | $ 1,500

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