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INVESTMENT SECURITIES (Tables)

3 Months Ended

Mar. 31, 2015

INVESTMENT SECURITIES [Abstract]

Amortized Cost and Estimated Fair Value of Investment Securities

The amortized cost and estimated fair value of investment securities as of March 31, 2015 and December 31, 2014 are as follows:

		March 31, 2015																December 31, 2014
						Gross				Gross												Gross				Gross
		Amortized				Unrealized				Unrealized				Fair				Amortized				Unrealized				Unrealized				Fair
(000's omitted)		Cost				Gains				Losses				Value				Cost				Gains				Losses				Value
Available-for-Sale Portfolio:
U.S. Treasury and agency securities		$	1,606,766			$	69,346			$	0			$	1,676,112			$	1,479,134			$	39,509			$	910			$	1,517,733
Obligations of state and political subdivisions			645,979				27,041				311				672,709				645,398				26,749				244				671,903
Government agency mortgage-backed securities			220,279				10,016				769				229,526				228,971				9,782				1,025				237,728
Corporate debt securities			26,770				277				21				27,026				26,803				363				75				27,091
Government agency collateralized mortgage obligations			16,307				673				0				16,980				17,330				695				0				18,025
Marketable equity securities			250				178				2				426				250				195				0				445
Total available-for-sale portfolio		$	2,516,351			$	107,531			$	1,103			$	2,622,779			$	2,397,886			$	77,293			$	2,254			$	2,472,925
Other Securities:
Federal Home Loan Bank common stock		$	13,149											$	13,149			$	19,553											$	19,553
Federal Reserve Bank common stock			16,050												16,050				16,050												16,050
Other equity securities			4,446												4,446				4,446												4,446
Total other securities		$	33,645											$	33,645			$	40,049											$	40,049

Summary of Investment Securities That Have Been in a Continuous Unrealized Loss Position for Less Than or Greater Than Twelve Months

A summary of investment securities that have been in a continuous unrealized loss position for less than, or greater than, twelve months is as follows:

As of March 31, 2015

		Less than 12 Months												12 Months or Longer												Total
										Gross												Gross												Gross
						Fair				Unrealized								Fair				Unrealized								Fair				Unrealized
(000's omitted)			#			Value				Losses					#			Value				Losses					#			Value				Losses
Available-for-Sale Portfolio:
Obligations of state and political subdivisions			31			$	18,327			$	271				3			$	1,209			$	40				34			$	19,536			$	311
Government agency mortgage-backed securities			2				2				0				19				34,302				769				21				34,304				769
Corporate debt securities			0				0				0				1				2,792				21				1				2,792				21
Government agency collateralized mortgage obligations			1				0				0				1				5				0				2				5				0
Marketable equity securities			1				99				2				0				0				0				1				99				2
Total available-for-sale/investment portfolio			35			$	18,428			$	273				24			$	38,308			$	830				59			$	56,736			$	1,103

As of December 31, 2014

		Less than 12 Months												12 Months or Longer												Total
										Gross												Gross												Gross
						Fair				Unrealized								Fair				Unrealized								Fair				Unrealized
(000's omitted)			#			Value				Losses					#			Value				Losses					#			Value				Losses
Available-for-Sale Portfolio:
U.S. Treasury and agency obligations			0			$	0			$	0				4			$	102,363			$	910				4			$	102,363			$	910
Obligations of state and political subdivisions			23				13,413				34				46				26,490				210				69				39,903				244
Government agency mortgage-backed securities			3				5				0				19				34,770				1,025				22				34,775				1,025
Corporate debt securities			1				3,040				1				1				2,755				74				2				5,795				75
Government agency collateralized mortgage obligations			1				0				0				1				5				0				2				5				0
Total available-for-sale/investment portfolio			28			$	16,458			$	35				71			$	166,383			$	2,219				99			$	182,841			$	2,254

Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity

The amortized cost and estimated fair value of debt securities at March 31, 2015, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.  Securities not due at a single maturity date are shown separately.

		Available-for-Sale
		Amortized				Fair
(000's omitted)		Cost				Value
Due in one year or less		$	40,781			$	41,170
Due after one through five years			163,322				167,984
Due after five years through ten years			1,834,409				1,914,623
Due after ten years			241,003				252,070
Subtotal			2,279,515				2,375,847
Government agency mortgage-backed securities			220,279				229,526
Government agency collateralized mortgage obligations			16,307				16,980
Total		$	2,516,101			$	2,622,353

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- Definition

A table of investments, shown as a text block.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 6

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Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

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- Definition

For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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