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EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Amounts Recognized in Balance Sheet and Income Statement [Table Text Block]

The following tables set forth information concerning amounts recognized in First Financial's Consolidated Balance Sheets and Consolidated Statements of Income related to the Company's pension plan:

		December 31,
(Dollars in thousands)		2017				2016
Change in benefit obligation
Benefit obligation at beginning of year		$	62,729			$	60,664
Service cost		4,894				5,034
Interest cost		2,325				2,262
Actuarial (gain) loss		6,107				142
Benefits paid, excluding settlement		(4,901		)		(5,373		)
Benefit obligation at end of year		71,154				62,729
Change in plan assets
Fair value of plan assets at beginning of year		131,011				125,714
Actual return on plan assets		18,239				10,670
Benefits paid, excluding settlement		(4,901		)		(5,373		)
Fair value of plan assets at end of year		144,349				131,011
Amounts recognized in the Consolidated Balance Sheets
Assets		73,195				68,282
Liabilities		0				0
Net amount recognized		$	73,195			$	68,282
Amounts recognized in accumulated other comprehensive income (loss)
Net actuarial loss		$	33,580			$	38,278
Net prior service cost		(1,921		)		(2,334		)
Deferred tax assets		(12,028		)		(13,141		)
Net amount recognized		$	19,631			$	22,803
Change in accumulated other comprehensive income (loss)		$	(3,172	)		$	(1,245	)
Accumulated benefit obligation		$	69,678			$	61,909

Schedule of Components of Net Periodic Benefit Cost [Table Text Block]

Components of net periodic benefit cost
		December 31,
(Dollars in thousands)		2017				2016				2015
Service cost		$	4,894			$	5,034			$	4,807
Interest cost		2,325				2,262				2,120
Expected return on assets		(9,358		)		(9,644		)		(9,444		)
Amortization of prior service cost		(413		)		(413		)		(413		)
Recognized net actuarial loss		1,924				1,608				1,888
Net periodic benefit (income) cost		(628		)		(1,153		)		(1,042		)
Other changes recognized in accumulated other comprehensive income (loss)
Net actuarial (gain) loss		(2,775		)		(884		)		11,014
Prior service cost		0				0				0
Amortization of prior service cost		413				413				413
Amortization of gain		(1,924		)		(1,608		)		(1,888		)
Total recognized in accumulated other comprehensive income (loss)		(4,286		)		(2,079		)		9,539
Total recognized in net periodic benefit cost and accumulated other comprehensive income (loss)		$	(4,914	)		$	(3,232	)		$	8,497
Amount expected to be recognized in net periodic pension expense in the coming year
Amortization of (gain) loss		$	2,090			$	1,754			$	1,642
Amortization of prior service credit		(413		)		(413		)		(413		)

Schedule of Assumptions Used [Table Text Block]

Pension plan assumptions
		December 31,
		2017			2016			2015
Benefit obligations
Discount rate		3.43	%		3.88	%		4.05	%
Rate of compensation increase		3.50	%		3.50	%		3.50	%
Net periodic benefit cost
Discount rate		3.88	%		4.05	%		3.76	%
Expected return on plan assets		7.25	%		7.50	%		7.50	%
Rate of compensation increase		3.50	%		3.50	%		3.50	%

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

The fair value of the plan assets as of December 31, 2017 by asset category is shown in the table that follows:

		Fair Value Measurements
(Dollars in thousands)		Total				Quoted Prices in  Active Markets  for  Identical Assets  (Level 1)				Significant Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
Asset Category
Cash		$	175			$	175			$	0			$	0
U. S. Government agencies		6,853				0				6,853				0
Fixed income mutual funds		69,154				69,154				0				0
Equity mutual funds		68,167				68,167				0				0
Total		$	144,349			$	137,496			$	6,853			$	0

The fair value of the plan assets as of December 31, 2016 by asset category is shown in the table that follows:

		Fair Value Measurements
(Dollars in thousands)		Total				Quoted Prices in  Active Markets  for  Identical Assets  (Level 1)				Significant Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
Asset Category
Cash		$	190			$	190			$	0			$	0
U. S. Government agencies		6,026				0				6,026				0
Fixed income mutual funds		66,483				66,483				0				0
Equity mutual funds		58,311				58,311				0				0
Total		$	131,010			$	124,984			$	6,026			$	0

Schedule of Expected Benefit Payments [Table Text Block]

The following benefit payments, which reflect expected future service, are expected to be paid:

(Dollars in thousands)		Retirement Benefits
2018		$	4,758
2019		4,426
2020		5,417
2021		5,771
2022		5,016
Thereafter		29,825

X

- Definition

Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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X

- Definition

Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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