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Comprehensive Income/(Loss) - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income/(Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net securities gains reclassified into earnings | $ (235) | $ (84) | $ (3,800) | $ (403)
Provision for income taxes | 8,334 | 6,516 | 27,295 | 20,855
Employee benefits (Non-interest expense) | 9,726 | 7,905 | 29,419 | 22,782
Interest and dividends on securities (Interest and dividend income) | (20,646) | (20,290) | (64,504) | (55,918)
Net effect on accumulated other comprehensive income/(loss) for the period | 355 | 537 | 1,343 | 1,463
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 | (169) | (9) | (199) | (9)
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 | (68) | (49) | (179) | (149)
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 | 592 | 595 | 1,721 | 1,621
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 gains reclassified into earnings | (219) | (11) | (258) | (11)
Provision for income taxes | 50 | 2 | 59 | 2
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 | 20 | 15 | 58 | 46
Interest and dividends on securities (Interest and dividend income) | (88) | (64) | (237) | (195)
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 | (175) | (177) | (554) | (672)
Employee benefits (Non-interest expense) | $ 767 | $ 772 | $ 2,275 | $ 2,293

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