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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | $ 1,144,923 | $ 1,021,944
Balance | 1,127,685 | 985,481
Available for Sale Securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | 0 | 256
Gains/(losses) recognized in OCI | 0 | (660)
Reclasses from OCI to net income | 0 | 361
Net period OCI | 0 | (299)
Balance | 0 | (43)
Pension/Post-retirement Benefits |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | 2,194 | (403)
Gains/(losses) recognized in OCI | 0 | 0
Reclasses from OCI to net income | 0 | 0
Net period OCI | 0 | 0
Balance | 2,194 | (403)
Accumulated other comprehensive loss |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | 2,194 | (147)
Gains/(losses) recognized in OCI | 0 | (660)
Reclasses from OCI to net income | 0 | 361
Net period OCI | 0 | (299)
Balance | $ 2,194 | $ (446)

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