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Other Comprehensive Income (Loss) (Components of AOCI) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 1,251,781	$ 1,196,065
Current period other comprehensive income (loss)	$ 569	$ (1,144)	2,689	8,520
Ending Balance	1,300,172	1,244,280	1,300,172	1,244,280
Unrealized gains on securities available for sale [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,489	13,967	(510)	3,951
Current period other comprehensive income (loss)	479	(1,515)	2,478	8,501
Ending Balance	1,968	12,452	1,968	12,452
Post-retirement obligations [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,987)	(6,185)	(3,056)	(6,424)
Current period other comprehensive income (loss)	36	141	105	380
Ending Balance	(2,951)	(6,044)	(2,951)	(6,044)
Unrealized gains (losses) on derivatives (cash flow hedges) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	221	(664)	169	(73)
Current period other comprehensive income (loss)	54	230	106	(361)
Ending Balance	275	(434)	275	(434)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,277)	7,118	(3,397)	(2,546)
Current period other comprehensive income (loss)	569	(1,144)	2,689	8,520
Ending Balance	$ (708)	$ 5,974	$ (708)	$ 5,974

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669619-108580

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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