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Other Comprehensive (Loss) Income - Schedule of Components of OCI (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unrealized gains and losses on securities available for sale: |  |  |
Net (losses) gains arising during the period | $ (3,612) | $ (7,405) | $ (5,683)
Reclassification adjustment for gains included in net income | 0 | (50) | (654)
Total | (3,612) | (7,455) | (6,337)
Unrealized gains (losses) on derivatives (cash flow hedges) | 633 | 404 | (122)
Amortization related to post retirement obligations | (1,475) | 5,628 | 2,156
Total other comprehensive (loss) income | (4,454) | (1,423) | (4,303)
Unrealized gains and losses on securities available for sale: |  |  |
Net (losses) gains arising during the period | 1,449 | 2,974 | 2,282
Reclassification adjustment for gains included in net income | 0 | 20 | 263
Total | 1,449 | 2,994 | 2,545
Unrealized gains (losses) on derivatives (cash flow hedges) | (254) | (162) | 49
Amortization related to post retirement obligations | 586 | (2,260) | (866)
Total other comprehensive (loss) income | 1,781 | 572 | 1,728
Unrealized gains and losses on securities available for sale: |  |  |
Net (losses) gains arising during the period | (2,163) | (4,431) | (3,401)
Reclassification adjustment for gains included in net income | 0 | (30) | (391)
Total | (2,163) | (4,461) | (3,792)
Unrealized gains (losses) on derivatives (cash flow hedges) | 379 | 242 | (73)
Amortization related to post retirement obligations | (889) | 3,368 | 1,290
Total other comprehensive loss | $ (2,673) | $ (851) | $ (2,575)

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