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FAIR VALUE (Tables)
6 Months Ended
Jun. 30, 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.
 
  
June 30, 2017
 
(000's omitted)
 
Level 1
  
Level 2
  
Level 3
  
Total Fair
Value
 
Available-for-sale investment securities:
            
U.S. Treasury and agency securities
 
$
1,928,311
  
$
147,487
  
$
0
  
$
2,075,798
 
Obligations of state and political subdivisions
  
0
   
573,472
   
0
   
573,472
 
Government agency mortgage-backed securities
  
0
   
333,447
   
0
   
333,447
 
Corporate debt securities
  
0
   
2,671
   
0
   
2,671
 
Government agency collateralized mortgage obligations
  
0
   
100,439
   
0
   
100,439
 
Marketable equity securities
  
497
   
0
   
0
   
497
 
Total available-for-sale investment securities
  
1,928,808
   
1,157,516
   
0
   
3,086,324
 
Mortgage loans held for sale
  
0
   
26
   
0
   
26
 
Commitments to originate real estate loans for sale
  
0
   
0
   
179
   
179
 
Forward sales commitments
  
0
   
5
   
0
   
5
 
Interest rate swap agreements asset
  
0
   
1,140
   
0
   
1,140
 
Interest rate swap agreements liability
  
0
   
(922
)
  
0
   
(922
)
Total
 
$
1,928,808
  
$
1,157,765
  
$
179
  
$
3,086,752
 
 
  
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
 
Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis
The changes in Level 3 assets measured at fair value on a recurring basis are summarized in the following tables:

  
Three Months Ended
  
Six Months Ended
 
  
June 30,
  
June 30,
 
  
2017
  
2016
  
2017
  
2016
 
(000's omitted)
 
Commitments
to Originate
Real Estate
Loans for Sale
  
Commitments
to Originate
Real Estate
 Loans for Sale
  
Commitments
to Originate
Real Estate
Loans for Sale
  
Commitments
to Originate
 Real Estate
Loans for Sale
 
Beginning balance
 
$
114
  
$
282
  
$
54
  
$
117
 
Total losses included in earnings (1)
  
(114
)
  
(282
)
  
(168
)
  
(399
)
Commitments to originate real estate loans held for sale, net
  
179
   
361
   
293
   
643
 
Ending balance
 
$
179
  
$
361
  
$
179
  
$
361
 

(1) Amounts included in earnings associated with the commitments to originate real estate loans for sale are reported as a component of other banking services in the Consolidated Statement of Income.
Assets and Liabilities Measured on a Non-Recurring Basis
The fair value information of assets and liabilities measured on a non-recurring basis presented below is not as of the period-end, but rather as of the date the fair value adjustment was recorded closest to the date presented.

  
June 30, 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
   
2,491
   
2,491
   
0
   
0
   
1,966
   
1,966
 
Total
 
$
0
  
$
0
  
$
2,491
  
$
2,491
  
$
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 are as follows:

(000's omitted)
 
Fair Value at
 June 30, 2017
 
Valuation Technique
Significant Unobservable Inputs
 
Significant
Unobservable Input
Range
(Weighted Average)
 
Other real estate owned
 
$
2,491
 
Fair Value of Collateral
Estimated cost of disposal/market adjustment
  
9.0% - 96.0% (35.8
%)
Commitments to originate real estate loans for sale
  
179
 
Discounted cash flow
Embedded servicing value
  
1
%

(000's omitted)
 
Fair Value at
 December 31, 2016
 
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 June 30, 2017 and December 31, 2016 are as follows:
 
  
June 30, 2017
  
December 31, 2016
 
(000's omitted)
 
Carrying
Value
  
Fair
Value
  
Carrying
Value
  
Fair
 Value
 
Financial assets:
            
Net loans
 
$
6,313,849
  
$
6,377,803
  
$
4,901,329
  
$
4,935,140
 
Financial liabilities:
                
Deposits
  
8,625,605
   
8,613,815
   
7,075,954
   
7,071,191
 
Short-term borrowings
  
179,000
   
179,000
   
146,200
   
146,200
 
Securities sold under agreement to repurchase, short-term
  
190,445
   
190,445
   
0
   
0
 
Other long-term debt
  
3,608
   
3,590
   
0
   
0
 
Subordinated debt held by unconsolidated subsidiary trusts
  
122,802
   
122,802
   
102,170
   
90,144