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Comprehensive Income/(Loss) - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | $ 2,023,139 | $ 1,403,026 | $ 1,978,827 | $ 1,395,321
Amounts reclassified from accumulated other comprehensive income/(loss) | 515 | 538 | 988 | 926
Total other comprehensive (loss) gain | 22,211 | (6,276) | 41,984 | (20,794)
Ending Balance | 2,074,116 | 1,524,106 | 2,074,116 | 1,524,106
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (16,542) | (18,626)
Other comprehensive income/(loss) before reclassifications |  |  | 0 |
Amounts reclassified from accumulated other comprehensive income/(loss) | 585 | 589 | 1,129 | 1,026
Total other comprehensive (loss) gain |  |  | 1,129 | 1,026
Ending Balance | (15,413) | (17,600) | (15,413) | (17,600)
Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (21,522) | (13,250)
Other comprehensive income/(loss) before reclassifications |  |  | 40,996 | (21,720)
Amounts reclassified from accumulated other comprehensive income/(loss) | 3 |  | (30) |
Total other comprehensive (loss) gain |  |  | 40,966 | (21,720)
Adoption of Accounting Standard ASU 2016-01 |  | (1,063) |  | (1,063)
Ending Balance | 19,444 | (36,033) | 19,444 | (36,033)
Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 193 | 381
Other comprehensive income/(loss) before reclassifications |  |  | 0 |
Amounts reclassified from accumulated other comprehensive income/(loss) | (73) | (51) | (111) | (100)
Total other comprehensive (loss) gain |  |  | (111) | (100)
Ending Balance | 82 | 281 | 82 | 281
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (18,098) | (47,076) | (37,871) | (31,495)
Other comprehensive income/(loss) before reclassifications |  |  | 40,996 | (21,720)
Amounts reclassified from accumulated other comprehensive income/(loss) |  |  | 988 | 926
Total other comprehensive (loss) gain | 22,211 | (6,276) | 41,984 | (20,794)
Adoption of Accounting Standard ASU 2016-01 |  | (1,063) |  | (1,063)
Ending Balance | $ 4,113 | $ (53,352) | $ 4,113 | $ (53,352)

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