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Other Comprehensive Income (Loss) - Amounts Reclassified Out of Each Component of AOCI (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Sep. 30, 2017

Sep. 30, 2016

Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]

Tax (expense) benefit

$ (8,491)

$ (6,945)

$ (24,127)

$ (20,601)

Available-for-sale securities:

Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]

Total before tax

(423)

455

(423)

926

Tax (expense) benefit

169

(182)

169

(370)

Net of tax

(254)

273

(254)

556

Net retirement plan actuarial (gain) loss

Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]

Total before tax

^[1],[2]

(376)

(335)

(1,130)

(1,004)

Tax (expense) benefit

149

134

451

402

Net of tax

(227)

(201)

(679)

(602)

Net retirement plan prior service cost

Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]

Total before tax

^[1],[2]

(3)

(20)

(11)

(58)

Tax (expense) benefit

1

8

4

23

Net of tax

(2)

(12)

(7)

(35)

Employee Benefit Plans

Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]

Total before tax

^[1],[2]

(379)

(355)

(1,141)

(1,062)

Tax (expense) benefit

^[1]

150

142

455

425

Net of tax

^[1]

(229)

(213)

(686)

(637)

Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Available-for-sale securities:

Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]

(Loss) gain on sale of available-for-sale securities

^[1]

(423)

455

(423)

926

Tax (expense) benefit

^[1]

169

(182)

169

(370)

Net of tax

^[1]

$ (254)

$ 273

$ (254)

$ 556

[1]	Amounts in parentheses indicated debits in income statement.
[2]	The accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit cost (See Note 10 - “Employee Benefit Plan”).

X

- Definition

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319

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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6515339

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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