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FAIR VALUE (Tables)

12 Months Ended

Dec. 31, 2017

FAIR VALUE [Abstract]

Summary of Fair Value Measured on a Recurring Basis

The following tables set forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis.  There were no transfers between any of the levels for the periods presented.

		December 31, 2017
(000's omitted)		Level 1				Level 2				Level 3				Total Fair Value
Available-for-sale investment securities:
U.S. Treasury and agency securities		$	1,909,290			$	144,781			$	0			$	2,054,071
Obligations of state and political subdivisions			0				528,956				0				528,956
Government agency mortgage-backed securities			0				357,538				0				357,538
Corporate debt securities			0				2,623				0				2,623
Government agency collateralized mortgage obligations			0				87,374				0				87,374
Marketable equity securities			526				0				0				526
Total available-for-sale investment securities			1,909,816				1,121,272				0				3,031,088
Mortgage loans held for sale			0				461				0				461
Commitments to originate real estate loans for sale			0				0				89				89
Forward sales commitments			0				4				0				4
Interest rate swap agreements asset			0				1,064				0				1,064
Interest rate swap agreements liability			0				(904	)			0				(904	)
Total		$	1,909,816			$	1,121,897			$	89			$	3,031,802

		December 31, 2016
(000's omitted)		Level 1				Level 2				Level 3				Total Fair Value
Available-for-sale investment securities:
U.S. Treasury and agency securities		$	1,902,762			$	0			$	0			$	1,902,762
Obligations of state and political subdivisions			0				594,990				0				594,990
Government agency mortgage-backed securities			0				235,230				0				235,230
Corporate debt securities			0				5,687				0				5,687
Government agency collateralized mortgage obligations			0				9,535				0				9,535
Marketable equity securities			452				0				0				452
Total available-for-sale investment securities			1,903,214				845,442				0				2,748,656
Mortgage loans held for sale			0				2,416				0				2,416
Commitments to originate real estate loans for sale			0				0				54				54
Forward sales commitments			0				3				0				3
Total		$	1,903,214			$	847,861			$	54			$	2,751,129

Assets and Liabilities Measured on a Non-Recurring Basis

Assets and liabilities measured on a non-recurring basis:

		December 31, 2017																December 31, 2016
(000's omitted)		Level 1				Level 2				Level 3				Total Fair Value				Level 1				Level 2				Level 3				Total Fair Value
Impaired loans		$	0			$	0			$	0			$	0			$	0			$	0			$	633			$	633
Other real estate owned			0				0				1,915				1,915				0				0				1,966				1,966
Total		$	0			$	0			$	1,915			$	1,915			$	0			$	0			$	2,599			$	2,599

Significant Unobservable Inputs, Fair Value Valuation Techniques

The significant unobservable inputs used in the determination of fair value of assets classified as Level 3 on a recurring or non-recurring basis as of December 31, 2017 are as follows:

(000's omitted)		Fair Value			Valuation Technique		Significant Unobservable Inputs		Significant Unobservable Input Range (Weighted Average)
Other real estate owned		$	1,915		Fair value of collateral		Estimated cost of disposal/market adjustment			9.0% - 99.0% (38.5	%)
Commitments to originate real estate loans for sale			89		Discounted cash flow		Embedded servicing value			1	%

The significant unobservable inputs used in the determination of fair value of assets classified as Level 3 on a recurring or non-recurring basis as of December 31, 2016 are as follows:

(000's omitted)		Fair Value			Valuation Technique		Significant Unobservable Inputs		Significant Unobservable Input Range (Weighted Average)
Other real estate owned		$	1,966		Fair value of collateral		Estimated cost of disposal/market adjustment			9.0% - 97.0% (29.6	%)
Impaired loans			633		Fair value of collateral		Estimated cost of disposal/market adjustment			15.0% - 50.0% (36.5	%)
Commitments to originate real estate loans for sale			54		Discounted cash flow		Embedded servicing value			1	%

Carrying Amounts and Estimated Fair Values of Other Financial Instruments

The carrying amounts and estimated fair values of the Company’s other financial instruments that are not accounted for at fair value at December 31, 2017 and 2016 are as follows:

		December 31, 2017								December 31, 2016
(000's omitted)		Carrying Value				Fair Value				Carrying Value				Fair Value
Financial assets:
Net loans		$	6,209,174			$	6,244,941			$	4,901,329				4,935,140
Financial liabilities:
Deposits			8,444,420				8,431,481				7,075,954				7,071,191
Short-term borrowings			24,000				24,000				146,200				146,200
Securities sold under agreement to repurchase, short-term			337,011				337,011				0				0
Other long-term debt			2,071				2,021				0				0
Subordinated debt held by unconsolidated subsidiary trusts			122,814				122,814				102,170				90,144

X

- Definition

Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, used to measure similar assets in prior periods (non-recurring basis) by class of asset or liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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