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Other Comprehensive Income (Loss) (Components of OCI) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income, before tax	$ 950	$ (1,912)	$ 4,496	$ 14,238
Total other comprehensive income (loss), tax effect	(381)	768	(1,807)	(5,718)
Reclassification adjustment for losses (gains) included in net income, after tax	(36)	(115)	(105)	(456)
Total other comprehensive income (loss)	569	(1,144)	2,689	8,520
Unrealized gains and losses on securities available for sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (losses) gains arising during the period, before tax	799	(2,575)	4,136	14,260
Reclassification adjustment for losses (gains) included in net income, before tax	0	43	0	(54)
Total other comprehensive (loss) income, before tax	799	(2,532)	4,136	14,206
Net (losses) gains arising during the period, tax effect	(320)	1,034	(1,658)	(5,727)
Reclassification adjustment for losses (gains) included in net income, tax effect	0	(17)	0	22
Total other comprehensive income (loss), tax effect	(320)	1,017	(1,658)	(5,705)
Net (losses) gains arising during the period, after tax	479	(1,541)	2,478	8,533
Reclassification adjustment for losses (gains) included in net income, after tax	0	26	0	(32)
Total other comprehensive income (loss)	479	(1,515)	2,478	8,501
Unrealized gains (losses) on derivatives (cash flow hedges) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income, before tax	90	384	177	(603)
Total other comprehensive income (loss), tax effect	(36)	(154)	(71)	242
Total other comprehensive income (loss)	54	230	106	(361)
Post-retirement obligations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income, before tax	61	236	183	635
Total other comprehensive income (loss), tax effect	(25)	(95)	(78)	(255)
Total other comprehensive income (loss)	$ 36	$ 141	$ 105	$ 380

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