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Other Comprehensive (Loss) Income - Schedule of Components of OCI (Detail) - USD ($) $ in Thousands	12 Months Ended
	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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