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Comprehensive Income/(Loss) - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income/(Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net securities losses (gains) reclassified into earnings | $ (2,909) | $ (358) | $ (3,566) | $ (319)
Provision for income taxes | 10,103 | 7,335 | 18,961 | 14,339
Employee benefits (Non-interest expense) | 9,705 | 7,965 | 19,694 | 14,877
Interest and dividends on securities (Interest and dividend income) | (21,586) | (19,249) | (43,859) | (35,628)
Net effect on accumulated other comprehensive income/(loss) for the period | 515 | 538 | 988 | 926
Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net effect on accumulated other comprehensive income/(loss) for the period | 3 |  | (30) |
Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net effect on accumulated other comprehensive income/(loss) for the period | (73) | (51) | (111) | (100)
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net effect on accumulated other comprehensive income/(loss) for the period | 585 | 589 | 1,129 | 1,026
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net securities losses (gains) reclassified into earnings | 4 |  | (38) |
Provision for income taxes | (1) |  | 8 |
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Provision for income taxes | 21 | 15 | 38 | 31
Interest and dividends on securities (Interest and dividend income) | (94) | (66) | (149) | (131)
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Provision for income taxes | (173) | (175) | (380) | (494)
Employee benefits (Non-interest expense) | $ 758 | $ 764 | $ 1,509 | $ 1,520

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