INVESTMENT SECURITIES (Tables)

6 Months Ended

Jun. 30, 2013

Amortized cost and estimated fair value of investment securities

The amortized cost and estimated fair value of investment securities as of June 30, 2013 and December 31, 2012 are as follows:

	June 30, 2013				December 31, 2012
		Gross	Gross			Gross	Gross
	Amortized	Unrealized	Unrealized	Fair	Amortized	Unrealized	Unrealized	Fair
(000's omitted)	Cost	Gains	Losses	Value	Cost	Gains	Losses	Value
Held-to-Maturity Portfolio:
U.S. Treasury and agency securities	$539,979	$39,627	$1,786	$577,820	$548,634	$59,081	$0	$607,715
Obligations of state and political subdivisions	61,826	3,196	0	65,022	65,742	5,850	0	71,592
Government agency mortgage-backed securities	14,475	148	0	14,623	20,578	1,079	0	21,657
Corporate debt securities	2,914	23	0	2,937	2,924	53	0	2,977
Other securities	13	0	0	13	16	0	0	16
Total held-to-maturity portfolio	$619,207	$42,994	$1,786	$660,415	$637,894	$66,063	$0	$703,957

Available-for-Sale Portfolio:
U.S. Treasury and agency securities	$764,446	$2,553	$9,129	$757,870	$988,217	$91,040	$0	$1,079,257
Obligations of state and political subdivisions	604,692	16,634	10,483	610,843	629,883	33,070	61	662,892
Government agency mortgage-backed securities	232,707	8,697	2,717	238,687	253,013	16,989	51	269,951
Pooled trust preferred securities	56,796	0	9,506	47,290	61,979	0	12,379	49,600
Government agency collateralized mortgage obligations	25,222	1,116	0	26,338	32,359	1,579	3	33,935
Corporate debt securities	24,082	942	226	24,798	24,136	1,265	44	25,357
Marketable equity securities	351	142	15	478	351	94	43	402
Total available-for-sale portfolio	$1,708,296	$30,084	$32,076	$1,706,304	$1,989,938	$144,037	$12,581	$2,121,394

Other Securities:
Federal Home Loan Bank common stock	$20,171			$20,171	$38,111			$38,111
Federal Reserve Bank common stock	16,050			16,050	16,050			16,050
Other equity securities	4,780			4,780	5,078			5,078
Total other securities	$41,001			$41,001	$59,239			$59,239

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 June 30, 2013

	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
Held-to-Maturity Portfolio:
U.S. Treasury and agency securities/
Total held-to-maturity portfolio	5	$99,373	$1,786	0	$0	$0	5	$99,373	$1,786

Available-for-Sale Portfolio:
U.S. Treasury and agency securities	15	$352,566	$9,129	0	$0	$0	15	$352,566	$9,129
Obligations of state and political subdivisions	314	202,253	10,449	2	908	34	316	203,161	10,483
Government agency mortgage-backed securities	46	57,788	2,717	0	0	0	46	57,788	2,717
Pooled trust preferred securities	0	0	0	3	47,290	9,506	3	47,290	9,506
Corporate debt securities	1	3,012	54	1	2,747	172	2	5,759	226
Government agency collateralized mortgage obligations	4	335	0	1	8	0	5	343	0
Marketable equity securities	0	0	0	1	186	15	1	186	15
Total available-for-sale portfolio	380	615,954	22,349	8	51,139	9,727	388	667,093	32,076
Total investment portfolio	385	$715,327	$24,135	8	$51,139	$9,727	393	$766,466	$33,862

As of December 31, 2012

	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	19	$11,503	$61	0	$0	$0	19	$11,503	$61
Pooled trust preferred securities	0	0	0	3	49,600	12,379	3	49,600	12,379
Government agency mortgage-backed securities	8	14,354	51	0	0	0	8	14,354	51
Corporate debt securities	1	2,905	44	0	0	0	1	2,905	44
Government agency collateralized mortgage obligations	4	426	2	2	1,041	1	6	1,467	3
Marketable equity securities	0	0	0	1	158	43	1	158	43
Total available-for-sale/investment portfolio	32	$29,188	$158	6	$50,799	$12,423	38	$79,987	$12,581

Amortized cost and estimated fair value of debt securities by contractual maturity

The amortized cost and estimated fair value of debt securities at June 30, 2013, 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.

	Held-to-Maturity		Available-for-Sale
	Amortized	Fair	Amortized	Fair
(000's omitted)	Cost	Value	Cost	Value
Due in one year or less	$8,786	$8,860	$35,212	$35,723
Due after one through five years	360,724	390,838	146,830	151,709
Due after five years through ten years	186,760	194,038	769,425	772,445
Due after ten years	48,462	52,056	498,549	480,924
Subtotal	604,732	645,792	1,450,016	1,440,801
Government agency collateralized mortgage obligations	0	0	25,222	26,338
Government agency mortgage-backed securities	14,475	14,623	232,707	238,687
Total	$619,207	$660,415	1,707,945	$1,705,826